feat(gen): add support for Gulp

Add an option to use Gulp instead of Grunt
Merge pull request #825 from stevemao/patch

fix(buid): no need to ngAnnotate oldieshim and vendor
Merge branch 'pr/672'

Conflicts:
	app/index.js
	templates/common/_package.json
finishing experimental gulp
Merge branch 'master' of https://github.com/yeoman/generator-angular