feat(@angular/cli): add ng4 option to ng new

This allows to create a project with Angular 4 in the template.
Also fixes a few issues with ng4.

Author: hansl

packages/@angular/cli/tasks/init.ts

@@ -71,6 +71,7 @@ export default Task.extend({
       inlineStyle: commandOptions.inlineStyle,
       inlineTemplate: commandOptions.inlineTemplate,
       ignoredUpdateFiles: ['favicon.ico'],
+      ng4: commandOptions.ng4,
       skipGit: commandOptions.skipGit,
       skipTests: commandOptions.skipTests
     };