[Representation] Prefetch templates

...to ensure that dialogs et al can be displayed, even
after loss of network connectivity.

https://github.com/nasa/openmctweb/issues/383

platform/representation/bundle.json

@@ -68,6 +68,19 @@
                     "agentService"
                 ]
             }
+        ],
+        "runs": [
+            {
+                "priority": "mandatory",
+                "implementation": "TemplatePrefetcher.js",
+                "depends": [
+                    "templateLinker",
+                    "templates[]",
+                    "views[]",
+                    "representations[]",
+                    "controls[]"
+                ]
+            }
         ]
     }
 }

platform/representation/src/TemplateLinker.js

@@ -54,7 +54,6 @@ define(
          * @param {string} the URL for the template
          * @returns {Promise.<string>} a promise for the HTML content of
          *          the template
-         * @private
          */
         TemplateLinker.prototype.load = function (templateUrl) {
             return this.$templateRequest(

platform/representation/src/TemplatePrefetcher.js

@@ -0,0 +1,49 @@
+/*****************************************************************************
+ * Open MCT Web, Copyright (c) 2014-2015, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT Web is licensed under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * Open MCT Web includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+/*global define,Promise*/
+
+define(
+    function () {
+        'use strict';
+
+        function concat(a, b) {
+            return a.concat(b);
+        }
+
+        /**
+         * Loads all templates when the application is started.
+         * @param {platform/representation.TemplateLinker} templateLinker
+         *        the `templateLinker` service, used to load and cache
+         *        template extensions
+         * @param {...{templateUrl: string}[]} extensions arrays
+         *        of template or template-like extensions
+         */
+        function TemplatePrefetcher(templateLinker, extensions) {
+            Array.prototype.slice.apply(arguments, [1])
+                .reduce(concat, [])
+                .map(templateLinker.getPath.bind(templateLinker))
+                .forEach(templateLinker.load.bind(templateLinker));
+        }
+
+        return TemplatePrefetcher;
+    }
+);