iOS 3 compatibility#4

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bitzeppelin wants to merge 5 commits intoTomSwift:masterfrom

bitzeppelin:ios3compatibility

Commits on Aug 8, 2011

Commits on Aug 10, 2011

TSAlertViewController should be retained by the window
hellhound
committed

Commits on Aug 13, 2011

bugfix: usesMessageTextView property should be backed-up by an iVar
hellhound
committed

Commits on Aug 16, 2011

bugfix: UIKeyboardFrameEndUserInfoKey is not present on iOS 3
hellhound
committed