Passport facebook login added.
Added all basic passport strategies (facebook, github, twitter, vkontakte, local, rememberMe). Improved config for passport. Added 'forum-passport' block, which will contaign auth link-buttons.
Merge branches 'feature-orm' and 'passport' of github.com:bem/bem-forum into feature-orm

Conflicts:
	server/github.js
	server/services/orm.js