fix build viewer

ng2-components/ng2-alfresco-viewer/main.ts

@@ -1,3 +1,20 @@
+/*!
+ * @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 {bootstrap} from 'angular2/platform/browser';
 import {Ng2AlfrescoViewerComponent} from './ng2-alfresco-viewer';
 

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

@@ -17,6 +17,8 @@
 
 import { Component } from 'angular2/core';
 
+declare let PDFJS: any;
+
 @Component({
     selector: 'ng2-alfresco-viewer',
     styles: [