diff --git a/vendor/assets/javascripts/select2.js b/vendor/assets/javascripts/select2.js
index 7590b822953..195ccee5bb0 100644
--- a/vendor/assets/javascripts/select2.js
+++ b/vendor/assets/javascripts/select2.js
@@ -1,7 +1,7 @@
 /*
 Copyright 2012 Igor Vaynberg
 
-Version: 3.5.2 Timestamp: Sat Nov  1 14:43:36 EDT 2014
+Version: 3.5.4 Timestamp: Sun Aug 30 13:30:32 EDT 2015
 
 This software is licensed under the Apache License, Version 2.0 (the "Apache License") or the GNU
 General Public License version 2 (the "GPL License"). You may choose either license to govern your
@@ -814,7 +814,7 @@ the specific language governing permissions and limitations under the Apache Lic
             // focusin can cause focus wars between modals and select2 since the dropdown is outside the modal.
             this.dropdown.on("click mouseup mousedown touchstart touchend focusin", function (e) { e.stopPropagation(); });
 
-            this.nextSearchTerm = undefined;
+            this.lastSearchTerm = undefined;
 
             if ($.isFunction(this.opts.initSelection)) {
                 // initialize selection based on the current value of the source element
@@ -870,17 +870,21 @@ the specific language governing permissions and limitations under the Apache Lic
                 select2.container.remove();
                 select2.liveRegion.remove();
                 select2.dropdown.remove();
-                element
-                    .show()
-                    .removeData("select2")
-                    .off(".select2")
-                    .prop("autofocus", this.autofocus || false);
-                if (this.elementTabIndex) {
-                    element.attr({tabindex: this.elementTabIndex});
+                element.removeData("select2")
+                    .off(".select2");
+                if (!element.is("input[type='hidden']")) {
+                    element
+                        .show()
+                        .prop("autofocus", this.autofocus || false);
+                    if (this.elementTabIndex) {
+                        element.attr({tabindex: this.elementTabIndex});
+                    } else {
+                        element.removeAttr("tabindex");
+                    }
+                    element.show();
                 } else {
-                    element.removeAttr("tabindex");
+                    element.css("display", "");
                 }
-                element.show();
             }
 
             cleanupJQueryElements.call(this,
@@ -932,6 +936,155 @@ the specific language governing permissions and limitations under the Apache Lic
                 });
             }
 
+            opts.debug = opts.debug || $.fn.select2.defaults.debug;
+
+            // Warnings for options renamed/removed in Select2 4.0.0
+            // Only when it's enabled through debug mode
+            if (opts.debug && console && console.warn) {
+                // id was removed
+                if (opts.id != null) {
+                    console.warn(
+                        'Select2: The `id` option has been removed in Select2 4.0.0, ' +
+                        'consider renaming your `id` property or mapping the property before your data makes it to Select2. ' +
+                        'You can read more at https://select2.github.io/announcements-4.0.html#changed-id'
+                    );
+                }
+
+                // text was removed
+                if (opts.text != null) {
+                    console.warn(
+                        'Select2: The `text` option has been removed in Select2 4.0.0, ' +
+                        'consider renaming your `text` property or mapping the property before your data makes it to Select2. ' +
+                        'You can read more at https://select2.github.io/announcements-4.0.html#changed-id'
+                    );
+                }
+
+                // sortResults was renamed to results
+                if (opts.sortResults != null) {
+                    console.warn(
+                        'Select2: the `sortResults` option has been renamed to `sorter` in Select2 4.0.0. '
+                    );
+                }
+
+                // selectOnBlur was renamed to selectOnClose
+                if (opts.selectOnBlur != null) {
+                    console.warn(
+                        'Select2: The `selectOnBlur` option has been renamed to `selectOnClose` in Select2 4.0.0.'
+                    );
+                }
+
+                // ajax.results was renamed to ajax.processResults
+                if (opts.ajax != null && opts.ajax.results != null) {
+                    console.warn(
+                        'Select2: The `ajax.results` option has been renamed to `ajax.processResults` in Select2 4.0.0.'
+                    );
+                }
+
+                // format* options were renamed to language.*
+                if (opts.formatNoResults != null) {
+                    console.warn(
+                        'Select2: The `formatNoResults` option has been renamed to `language.noResults` in Select2 4.0.0.'
+                    );
+                }
+                if (opts.formatSearching != null) {
+                    console.warn(
+                        'Select2: The `formatSearching` option has been renamed to `language.searching` in Select2 4.0.0.'
+                    );
+                }
+                if (opts.formatInputTooShort != null) {
+                    console.warn(
+                        'Select2: The `formatInputTooShort` option has been renamed to `language.inputTooShort` in Select2 4.0.0.'
+                    );
+                }
+                if (opts.formatInputTooLong != null) {
+                    console.warn(
+                        'Select2: The `formatInputTooLong` option has been renamed to `language.inputTooLong` in Select2 4.0.0.'
+                    );
+                }
+                if (opts.formatLoading != null) {
+                    console.warn(
+                        'Select2: The `formatLoading` option has been renamed to `language.loadingMore` in Select2 4.0.0.'
+                    );
+                }
+                if (opts.formatSelectionTooBig != null) {
+                    console.warn(
+                        'Select2: The `formatSelectionTooBig` option has been renamed to `language.maximumSelected` in Select2 4.0.0.'
+                    );
+                }
+
+                if (opts.element.data('select2Tags')) {
+                    console.warn(
+                        'Select2: The `data-select2-tags` attribute has been renamed to `data-tags` in Select2 4.0.0.'
+                    );
+                }
+            }
+
+            // Aliasing options renamed in Select2 4.0.0
+
+            // data-select2-tags -> data-tags
+            if (opts.element.data('tags') != null) {
+                var elemTags = opts.element.data('tags');
+
+                // data-tags should actually be a boolean
+                if (!$.isArray(elemTags)) {
+                    elemTags = [];
+                }
+
+                opts.element.data('select2Tags', elemTags);
+            }
+
+            // sortResults -> sorter
+            if (opts.sorter != null) {
+                opts.sortResults = opts.sorter;
+            }
+
+            // selectOnBlur -> selectOnClose
+            if (opts.selectOnClose != null) {
+                opts.selectOnBlur = opts.selectOnClose;
+            }
+
+            // ajax.results -> ajax.processResults
+            if (opts.ajax != null) {
+                if ($.isFunction(opts.ajax.processResults)) {
+                    opts.ajax.results = opts.ajax.processResults;
+                }
+            }
+
+            // Formatters/language options
+            if (opts.language != null) {
+                var lang = opts.language;
+
+                // formatNoMatches -> language.noMatches
+                if ($.isFunction(lang.noMatches)) {
+                    opts.formatNoMatches = lang.noMatches;
+                }
+
+                // formatSearching -> language.searching
+                if ($.isFunction(lang.searching)) {
+                    opts.formatSearching = lang.searching;
+                }
+
+                // formatInputTooShort -> language.inputTooShort
+                if ($.isFunction(lang.inputTooShort)) {
+                    opts.formatInputTooShort = lang.inputTooShort;
+                }
+
+                // formatInputTooLong -> language.inputTooLong
+                if ($.isFunction(lang.inputTooLong)) {
+                    opts.formatInputTooLong = lang.inputTooLong;
+                }
+
+                // formatLoading -> language.loadingMore
+                if ($.isFunction(lang.loadingMore)) {
+                    opts.formatLoading = lang.loadingMore;
+                }
+
+                // formatSelectionTooBig -> language.maximumSelected
+                if ($.isFunction(lang.maximumSelected)) {
+                    opts.formatSelectionTooBig = lang.maximumSelected;
+                }
+            }
+
             opts = $.extend({}, {
                 populateResults: function(container, results, query) {
                     var populate, id=this.opts.id, liveRegion=this.liveRegion;
@@ -975,7 +1128,6 @@ the specific language governing permissions and limitations under the Apache Lic
 
 
                             if (compound) {
-
                                 innerContainer=$("<ul></ul>");
                                 innerContainer.addClass("select2-result-sub");
                                 populate(result.children, innerContainer, depth+1);
@@ -1046,7 +1198,6 @@ the specific language governing permissions and limitations under the Apache Lic
                 opts.id=function(e) { return e.id; };
             } else {
                 if (!("query" in opts)) {
-
                     if ("ajax" in opts) {
                         ajaxUrl = opts.element.data("ajax-url");
                         if (ajaxUrl && ajaxUrl.length > 0) {
@@ -1325,10 +1476,11 @@ the specific language governing permissions and limitations under the Apache Lic
             };
 
             if (above) {
-                css.top = offset.top - dropHeight;
-                css.bottom = 'auto';
                 this.container.addClass("select2-drop-above");
                 $dropdown.addClass("select2-drop-above");
+                dropHeight = $dropdown.outerHeight(false);
+                css.top = offset.top - dropHeight;
+                css.bottom = 'auto';
             }
             else {
                 css.top = dropTop;
@@ -1481,6 +1633,9 @@ the specific language governing permissions and limitations under the Apache Lic
 
             this.clearSearch();
             this.search.removeClass("select2-active");
+
+            // Remove the aria active descendant for highlighted element
+            this.search.removeAttr("aria-activedescendant");
             this.opts.element.trigger($.Event("select2-close"));
         },
 
@@ -1499,6 +1654,27 @@ the specific language governing permissions and limitations under the Apache Lic
 
         },
 
+        /**
+         * @return {Boolean} Whether or not search value was changed.
+         * @private
+         */
+        prefillNextSearchTerm: function () {
+            // initializes search's value with nextSearchTerm (if defined by user)
+            // ignore nextSearchTerm if the dropdown is opened by the user pressing a letter
+            if(this.search.val() !== "") {
+                return false;
+            }
+
+            var nextSearchTerm = this.opts.nextSearchTerm(this.data(), this.lastSearchTerm);
+            if(nextSearchTerm !== undefined){
+                this.search.val(nextSearchTerm);
+                this.search.select();
+                return true;
+            }
+
+            return false;
+        },
+
         //abstract
         getMaximumSelectionSize: function() {
             return evaluate(this.opts.maximumSelectionSize, this.opts.element);
@@ -1812,6 +1988,9 @@ the specific language governing permissions and limitations under the Apache Lic
 
                 if (data.results.length === 0 && checkFormatter(opts.formatNoMatches, "formatNoMatches")) {
                     render("<li class='select2-no-results'>" + evaluate(opts.formatNoMatches, opts.element, search.val()) + "</li>");
+                    if(this.showSearch){
+                        this.showSearch(search.val());
+                    }
                     return;
                 }
 
@@ -1916,7 +2095,7 @@ the specific language governing permissions and limitations under the Apache Lic
                 } else if (this.opts.width === "copy" || this.opts.width === "resolve") {
                     // check if there is inline style on the element that contains width
                     style = this.opts.element.attr('style');
-                    if (style !== undefined) {
+                    if (typeof(style) === "string") {
                         attrs = style.split(';');
                         for (i = 0, l = attrs.length; i < l; i = i + 1) {
                             attr = attrs[i].replace(/\s/g, '');
@@ -2015,14 +2194,7 @@ the specific language governing permissions and limitations under the Apache Lic
                 }
             }
 
-            // initializes search's value with nextSearchTerm (if defined by user)
-            // ignore nextSearchTerm if the dropdown is opened by the user pressing a letter
-            if(this.search.val() === "") {
-                if(this.nextSearchTerm != undefined){
-                    this.search.val(this.nextSearchTerm);
-                    this.search.select();
-                }
-            }
+            this.prefillNextSearchTerm();
 
             this.focusser.prop("disabled", true).val("");
             this.updateResults(true);
@@ -2109,7 +2281,7 @@ the specific language governing permissions and limitations under the Apache Lic
             this.focusser.attr("id", "s2id_autogen"+idSuffix);
 
             elementLabel = $("label[for='" + this.opts.element.attr("id") + "']");
-            this.opts.element.focus(this.bind(function () { this.focus(); }));
+            this.opts.element.on('focus.select2', this.bind(function () { this.focus(); }));
 
             this.focusser.prev()
                 .text(elementLabel.text())
@@ -2165,7 +2337,7 @@ the specific language governing permissions and limitations under the Apache Lic
                 // without this the search field loses focus which is annoying
                 if (document.activeElement === this.body.get(0)) {
                     window.setTimeout(this.bind(function() {
-                        if (this.opened()) {
+                        if (this.opened() && this.results && this.results.length > 1) {
                             this.search.focus();
                         }
                     }), 0);
@@ -2317,7 +2489,7 @@ the specific language governing permissions and limitations under the Apache Lic
                         self.updateSelection(selected);
                         self.close();
                         self.setPlaceholder();
-                        self.nextSearchTerm = self.opts.nextSearchTerm(selected, self.search.val());
+                        self.lastSearchTerm = self.search.val();
                     }
                 });
             }
@@ -2454,7 +2626,7 @@ the specific language governing permissions and limitations under the Apache Lic
 
             this.opts.element.trigger({ type: "select2-selected", val: this.id(data), choice: data });
 
-            this.nextSearchTerm = this.opts.nextSearchTerm(data, this.search.val());
+            this.lastSearchTerm = this.search.val();
             this.close();
 
             if ((!options || !options.noFocus) && this.opts.shouldFocusInput(this)) {
@@ -2508,9 +2680,23 @@ the specific language governing permissions and limitations under the Apache Lic
 
             if (arguments.length > 1) {
                 triggerChange = arguments[1];
+
+                if (this.opts.debug && console && console.warn) {
+                    console.warn(
+                        'Select2: The second option to `select2("val")` is not supported in Select2 4.0.0. ' +
+                        'The `change` event will always be triggered in 4.0.0.'
+                    );
+                }
             }
 
             if (this.select) {
+                if (this.opts.debug && console && console.warn) {
+                    console.warn(
+                        'Select2: Setting the value on a <select> using `select2("val")` is no longer supported in 4.0.0. ' +
+                        'You can use the `.val(newValue).trigger("change")` method provided by jQuery instead.'
+                    );
+                }
+
                 this.select
                     .val(val)
                     .find("option").filter(function() { return this.selected }).each2(function (i, elm) {
@@ -2559,6 +2745,13 @@ the specific language governing permissions and limitations under the Apache Lic
                 if (data == undefined) data = null;
                 return data;
             } else {
+                if (this.opts.debug && console && console.warn) {
+                    console.warn(
+                        'Select2: The `select2("data")` method can no longer set selected values in 4.0.0, ' +
+                        'consider using the `.val()` method instead.'
+                    );
+                }
+
                 if (arguments.length > 1) {
                     triggerChange = arguments[1];
                 }
@@ -2704,7 +2897,7 @@ the specific language governing permissions and limitations under the Apache Lic
             this.search.prev()
                 .text($("label[for='" + this.opts.element.attr("id") + "']").text())
                 .attr('for', this.search.attr('id'));
-            this.opts.element.focus(this.bind(function () { this.focus(); }));
+            this.opts.element.on('focus.select2', this.bind(function () { this.focus(); }));
 
             this.search.on("input paste", this.bind(function() {
                 if (this.search.attr('placeholder') && this.search.val().length == 0) return;
@@ -2922,16 +3115,9 @@ the specific language governing permissions and limitations under the Apache Lic
 
             this.focusSearch();
 
-            // initializes search's value with nextSearchTerm (if defined by user)
-            // ignore nextSearchTerm if the dropdown is opened by the user pressing a letter
-            if(this.search.val() === "") {
-                if(this.nextSearchTerm != undefined){
-                    this.search.val(this.nextSearchTerm);
-                    this.search.select();
-                }
-            }
-
+            this.prefillNextSearchTerm();
             this.updateResults(true);
+
             if (this.opts.shouldFocusInput(this)) {
                 this.search.focus();
             }
@@ -2957,21 +3143,18 @@ the specific language governing permissions and limitations under the Apache Lic
 
         // multi
         updateSelection: function (data) {
-            var ids = [], filtered = [], self = this;
+            var ids = {}, filtered = [], self = this;
 
             // filter out duplicates
             $(data).each(function () {
-                if (indexOf(self.id(this), ids) < 0) {
-                    ids.push(self.id(this));
+                if (!(self.id(this) in ids)) {
+                    ids[self.id(this)] = 0;
                     filtered.push(this);
                 }
             });
-            data = filtered;
 
             this.selection.find(".select2-search-choice").remove();
-            $(data).each(function () {
-                self.addSelectedChoice(this);
-            });
+            this.addSelectedChoice(filtered);
             self.postprocessResults();
         },
 
@@ -2998,7 +3181,7 @@ the specific language governing permissions and limitations under the Apache Lic
             this.opts.element.trigger({ type: "selected", val: this.id(data), choice: data });
 
             // keep track of the search's value before it gets cleared
-            this.nextSearchTerm = this.opts.nextSearchTerm(data, this.search.val());
+            this.lastSearchTerm = this.search.val();
 
             this.clearSearch();
             this.updateResults();
@@ -3018,10 +3201,8 @@ the specific language governing permissions and limitations under the Apache Lic
                         this.updateResults(true);
                     } else {
                         // initializes search's value with nextSearchTerm and update search result
-                        if(this.nextSearchTerm != undefined){
-                            this.search.val(this.nextSearchTerm);
+                        if (this.prefillNextSearchTerm()) {
                             this.updateResults();
-                            this.search.select();
                         }
                     }
                     this.positionDropdown();
@@ -3047,6 +3228,14 @@ the specific language governing permissions and limitations under the Apache Lic
         },
 
         addSelectedChoice: function (data) {
+            var val = this.getVal(), self = this;
+            $(data).each(function () {
+                val.push(self.createChoice(this));
+            });
+            this.setVal(val);
+        },
+
+        createChoice: function (data) {
             var enableChoice = !data.locked,
                 enabledItem = $(
                     "<li class='select2-search-choice'>" +
@@ -3059,7 +3248,6 @@ the specific language governing permissions and limitations under the Apache Lic
                     "</li>");
             var choice = enableChoice ? enabledItem : disabledItem,
                 id = this.id(data),
-                val = this.getVal(),
                 formatted,
                 cssClass;
 
@@ -3093,8 +3281,7 @@ the specific language governing permissions and limitations under the Apache Lic
             choice.data("select2-data", data);
             choice.insertBefore(this.searchContainer);
 
-            val.push(id);
-            this.setVal(val);
+            return id;
         },
 
         // multi
@@ -3226,14 +3413,16 @@ the specific language governing permissions and limitations under the Apache Lic
 
         // multi
         setVal: function (val) {
-            var unique;
             if (this.select) {
                 this.select.val(val);
             } else {
-                unique = [];
+                var unique = [], valMap = {};
                 // filter out duplicates
                 $(val).each(function () {
-                    if (indexOf(this, unique) < 0) unique.push(this);
+                    if (!(this in valMap)) {
+                        unique.push(this);
+                        valMap[this] = 0;
+                    }
                 });
                 this.opts.element.val(unique.length === 0 ? "" : unique.join(this.opts.separator));
             }
@@ -3249,11 +3438,9 @@ the specific language governing permissions and limitations under the Apache Lic
                 for (var j = 0; j < old.length; j++) {
                     if (equal(this.opts.id(current[i]), this.opts.id(old[j]))) {
                         current.splice(i, 1);
-                        if(i>0){
-                            i--;
-                        }
+                        i--;
                         old.splice(j, 1);
-                        j--;
+                        break;
                     }
                 }
             }
@@ -3423,6 +3610,7 @@ the specific language governing permissions and limitations under the Apache Lic
 
     // plugin defaults, accessible to users
     $.fn.select2.defaults = {
+        debug: false,
         width: "copy",
         loadMorePadding: 0,
         closeOnSelect: true,