fix(broccoli): tune the build graph, support any asset file

Author: IgorMinar

lib/broccoli/angular2-app.js

@@ -29,13 +29,9 @@ Angular2App.prototype.toTree = function () {
         allowEmpty: true
     });
 
-    var cssTree = new Funnel(sourceTree, {
-        include: ['**/*.css'],
-        allowEmpty: true
-    });
-
-    var htmlTree = new Funnel(sourceTree, {
-        include: ['**/*.html'],
+    var assetTree = new Funnel(sourceTree, {
+        include: ['**/*.*'],
+        exclude: ['**/*.ts', '**/*.js'],
         allowEmpty: true
     });
 
@@ -57,7 +53,7 @@ Angular2App.prototype.toTree = function () {
     //     outputFile: '/app.js'
     // });
 
-    return mergeTrees([tsSrcTree, tsTree, jsTree, cssTree, htmlTree, this.index(), vendorJsTree], { overwrite: true });
+    return mergeTrees([assetTree, tsSrcTree, tsTree, jsTree, this.index(), vendorJsTree], { overwrite: true });
 };
 
 /**