Enriching our RunAroundUser model with utility methods

Very much like PHP runaround application I have added some static and some instance methods which provider useful information such as:

• Get the logged in user (either native user or the one which has used Facebook)
• Get the name and email of user  (from facebook or the one stored in DataStore) 
• Register the Facebook user in our datastore
• Register the user to Facebook (Still in construction ......)
• Methods to login and logout the user