AngularJS: support calling angular.bootstrap on the document

angularjs/angular.d.ts

@@ -61,7 +61,7 @@ declare module angular {
          * @param config an object for defining configuration options for the application. The following keys are supported:
          *     - `strictDi`: disable automatic function annotation for the application. This is meant to assist in finding bugs which break minified code.
          */
-        bootstrap(element: string|Element|JQuery, modules?: (string|Function|any[])[], config?: IAngularBootstrapConfig): auto.IInjectorService;
+        bootstrap(element: string|Element|JQuery|Document, modules?: (string|Function|any[])[], config?: IAngularBootstrapConfig): auto.IInjectorService;
 
         /**
          * Creates a deep copy of source, which should be an object or an array.