[Roots] Move my-items to separate bundle

My Items root is now opt-in, and does not need to be enabled for all
deployments.  My Items is enabled by default in the development edition.

https://github.com/nasa/openmct/issues/1251

index.html

@@ -32,7 +32,8 @@
             [
                 'example/imagery',
                 'example/eventGenerator',
-                'example/generator'
+                'example/generator',
+                'platform/features/my-items'
             ].forEach(
                 openmct.legacyRegistry.enable.bind(openmct.legacyRegistry)
             );

platform/core/bundle.js

@@ -409,16 +409,6 @@ define([
                     ]
                 }
             ],
-            "roots": [
-                {
-                    "id": "mine",
-                    "model": {
-                        "name": "My Items",
-                        "type": "folder",
-                        "composition": []
-                    }
-                }
-            ],
             "runs": [
                 {
                     "implementation": TransactingMutationListener,

platform/features/my-items/bundle.js

@@ -0,0 +1,45 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2016, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT 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 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.
+ *****************************************************************************/
+
+define([
+    'legacyRegistry'
+], function (
+    legacyRegistry
+) {
+
+    legacyRegistry.register("platform/features/my-items", {
+        "name": "My Items",
+        "description": "Defines a root named My Items",
+        "extensions": {
+            "roots": [
+                {
+                    "id": "mine",
+                    "model": {
+                        "name": "My Items",
+                        "type": "folder",
+                        "composition": []
+                    }
+                }
+            ]
+        }
+    });
+});

src/defaultRegistry.js

@@ -71,6 +71,7 @@ define([
     '../platform/features/conductor-v2/utcTimeSystem/bundle',
     '../platform/features/imagery/bundle',
     '../platform/features/layout/bundle',
+    '../platform/features/my-items/bundle',
     '../platform/features/pages/bundle',
     '../platform/features/plot/bundle',
     '../platform/features/static-markup/bundle',