moved signin logic to client-side
simplified the client auth logic, credit to http://frederiknakstad.com/2013/01/21/authentication-in-single-page-applications-with-angular-js/
add routingConfig to global for jshint
changed User controller login, create to returning status code and jsonp
added mandatory to email in User model
moved signup logic to client-side, added validation to signup view, re-structured project folders
moved articles resource to public folder
removed referring common folder for karma test
some minor changes for jshint
installed grunt-contrib-sass for generating sourcemap files
removed grunt-contrib-compass
deleted app/views/users
changed coffee src folder location in gruntfile.js
simplified anth view and signup view
created validate in Auth service
added cbUnique directive for custom validation (to be continued)
updated gruntfile & package.json
added cbAsyncValidator directive, added async validation of email unicity
moved has-[success|error] class to has-feedback wrapping div
added bootstrap sass