style(global): group multiple imports from same module

Closes #7802

Closes #8209

modules/angular2/test/mock/view_resolver_mock_spec.ts

@@ -8,14 +8,12 @@ import {
   it,
 } from 'angular2/testing_internal';
 
-import {stringify} from 'angular2/src/facade/lang';
+import {stringify, isBlank} from 'angular2/src/facade/lang';
 
 import {MockViewResolver} from 'angular2/src/mock/view_resolver_mock';
 
 import {Component, ViewMetadata} from 'angular2/src/core/metadata';
 
-import {isBlank} from 'angular2/src/facade/lang';
-
 export function main() {
   describe('MockViewResolver', () => {
     var viewResolver: MockViewResolver;