Added handling of keyboardAnimationCurve on iOS 7 to fix out of sync frame animations with keyboard changes. Also fixed issue where MessageComposerView wasn't stuck to the bottom of the window on iOS 7 due to the switch to a overlaying status bar. Add an ease of use initializer  to allow users to set a static offset from the bottom of the screen/top of keyboard to allow easier intergration with UITabBarController and custom views as requested by issue #1. Bumped to version 1.1.0