Adding inviteVC

Adding a viewController to invite friends. First, selection of source.
Calling new VC

Calling new viewController.
Adding InviceContactsVC

Adding a new viewController to show all contacts (first 50) in the
address book.
Minor change

Changing default min number.
Changing centerVC

Suppressing address book from centerViewController.
Calling new VC

Calling new viewController when clicking on "Contact".
Suppressing unused VC

Suppressing an unused viewController. Suppressing imports.
Adding ordering

Adding ordering to array. Now displays contacts ordered by name.
Update doc
Scrolling to bottom

Scrolling to bottom of list of messages. Changing frame of tableView.
Adding message in list.
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