Add conditions to fix compilers warnings under iOS 6 sdk

Version bump (1.5.1)

Fix tint color error in iOS 6

Use UIKeyboardAppearanceAlert instead of UIKeyboardAppearanceDark

Version bump (1.3.2)

Version bump (1.3.1)

Add interface for registerClass:forCellWithReuseIdentifier:bundle:

Version bump (1.2.7)

Version bump (1.2.6)

Version bump (1.2.5)