core library implementation; license fixes

- library with code/utils to be shared across other components or top
level application;
- moved MDL directive to core as an example
- license fixes

demo-shell-ng2/app/components/files/files.component.ts

@@ -1,6 +1,22 @@
+/**
+ * @license
+ * Copyright (C) 2016 Alfresco Software Limited.
+ *
+ * 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.
+ */
 import {Component} from 'angular2/core';
 import {DocumentList} from 'ng2-alfresco-documentlist/ng2-alfresco-documentlist';
-import {MDL} from '../common/MaterialDesignLiteUpgradeElement';
+import {MDL} from 'ng2-alfresco-core/material';
 
 @Component({
     selector: 'files-component',