- Name login form items (the form itself and user/password inputs)

Hi aliens,

This pull request aims to name Alien's login form items. I needed it to integrate Alien within an SSO framework. 
So here is the summary of changes : 
- Name login form items (the form itself and user/password inputs)
- Remove the login form div if user is logged (previously it was only hidden)

Thanks,
Loïc