Fixed support for keyboard cache on iOS 6(+)
Use same method to purge cache for all iOS versions
Removed unused #define
Removed unused header info
Always include parens after %orig
Forcing refresh of keyboard is not needed in iOS 5+
Updated comments
Use %ctor
Forcing redraw of keyboard is necessary in iOS 7
Slightly rearranged code
Updated for release (v1.3.2)