Bad solution for making sure that an invited facebook user is marked immediately as having been invited

Fix contact count displayed on the right for good. Also use only one randomization when selecting the random contacts to display.

Put a select limit on the person query on contactsController index, since we know exactly what we're doing with the data

InvitationsController update has an error, and our non-specific error catching is messing up knowing what our problems are

Show correct contact count in right bar when changing target aspect.