Add a "Profile" page for user

[smoneuse]

In case the user wand to update its password for example.

• Register/update user e-mail adress

Action with e-mail update token ( backends sends a mail to the user with an action token, when recieving a valid token, perform the waiting update) :

• Add feature for password update : On user profile page and on login page ("I forgot my password")

Other profile stuff :

• Allow user to register an url for profile picture : Do not store the image, just the link
• Display the profile picture on the "Profile link"
• Display a friend profile picture on the friends lists