Extensions Cleanup (#359)

* clean up extensions

* updated copyrights

* formatting

src/typings/chokidar.d.ts

@@ -3,7 +3,7 @@
  *  Licensed under the Source EULA. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-declare module 'chokidar' {
+declare module 'vscode-chokidar' {
 
 	/**
 	 *  takes paths to be watched recursively and options

src/vs/workbench/services/files/node/watcher/unix/chokidarWatcherService.ts

@@ -5,7 +5,7 @@
 
 'use strict';
 
-import chokidar = require('chokidar');
+import chokidar = require('vscode-chokidar');
 import fs = require('fs');
 
 import gracefulFs = require('graceful-fs');