working on invites
added connections
adding a users aggregator to connect
added a better callback caller than call_object_method
- removed the handlable 
- added a constructor
fixed typos with the invoke_callback
user aggregate
adding a json view for the invite. API first
Merge branch 'master' into invite
no need for oauth users
renamed default inviter to default
added social inviter object
Merge branch 'master' into invite
no need for the fb invite to show the list of fb users
simplified the invite.
fix bug for mixing identifiers
added an internal error exception
restify invites
set a default constructor to array
ability to set a return.