Fixes crash because of bad KVO removal at dealloc
Checks if the tabBar is hidden when calculating the keyboard height. Inspired from @VincentSit fix in commit 9a6afb7
Fixes an unsatisfiable constraints in left button, fixing highlighted state too. Inspired from @VincentSite implementation in commit d0003e5
Fixes interactive dismiss mode on iOS7. Fixes #11
Updates the sample project