Feature/style login page

# This pull request involves:

* Styles for login user page
* Fix failing specs
* Start to use smacss
Bootstrap has variables for these kind of values: http://getbootstrap.com/customize/, use them instead of just overrides them, not sure how are you setting bootstrap in the project but I found useful to use: https://github.com/twbs/bootstrap-sass, an here: https://github.com/twbs/bootstrap-sass/blob/master/assets/stylesheets/bootstrap/_variables.scss are the variables set, if you need more guidance don't hesitate to ask ^^