nicoJiang:models and controllers modified
Merge branch 'dev' of https://github.com/avocadocn/mean into dev
nicoJiang:增加邮箱验证功能
Merge branch 'dev' of https://github.com/avocadocn/mean into dev

Conflicts:
	app/views/company/company_signup.jade
Merge branch 'dev' of https://github.com/avocadocn/mean into dev