[ADF-1623] routing integration for Viewer (#2404)

* routed viewer (demo app)

* toolbar support

* app menu component for demo shell

* navigate back button

* fix unit tests

* improve viewer type detection and rendering

* download button

* automatic pdf rendition, spinners, ui tweaks

* border for pdf pages

* scroll top support

* docs update

* info drawer placeholder

ng2-components/ng2-alfresco-viewer/src/components/unknown-format/unknown-format.component.ts

@@ -0,0 +1,26 @@
+/*!
+ * @license
+ * Copyright 2016 Alfresco Software, Ltd.
+ *
+ * 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 '@angular/core';
+
+@Component({
+    selector: 'adf-viewer-unknown-format',
+    templateUrl: 'unknown-format.component.html',
+    styleUrls: ['unknown-format.component.scss']
+})
+export class UnknownFormatComponent {
+}