Added and testing suggestion for attr update on user http://bit.ly/1oeIW3v

* Made various changes to the user controller accessors for simplicity.
* Added :aname to user_params (supposed to be a fix for attrib update)
* finish_signup now redirects to root_path instead of to the current_user
* Refactoring suggestion applied to identity model http://bit.ly/1mpeqae
* Fields added to edit and new for devise registrations views
* Stripped whitelist from resources :users (index, update, show)
* Added /profile route to point to users#show as :profile
* Changed before_action to :edit (from [:new, :create, :update, :destroy])
* Added sanitized parameters as per devise suggestion http://bit.ly/VjNOw6