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
     };

tests/e2e/setup/500-create-project.ts

@@ -24,7 +24,7 @@ export default function() {
   } else {
     // Otherwise create a project from scratch.
     createProject = Promise.resolve()
-      .then(() => ng('new', 'test-project', '--skip-npm', argv['ng4'] ? '--ng4' : '--'))
+      .then(() => ng('new', 'test-project', '--skip-npm', ...(argv['ng4'] ? ['--ng4'] : [])))
       .then(() => expectFileToExist(join(process.cwd(), 'test-project')))
       .then(() => process.chdir('./test-project'));
   }