Replace `backgroundStyle` and `backgroundOpacity` with `backgroundColor`
Fix UIAppearance subclass and presentedFormSheetSize bug
Merge pull request #4 from dulaccc/background-color

Background color of the background view
Fix backgroundColor UIAppearance bug
Fix formSheetSize in apperance proxy
Readme update
Update Xcode5 example
Update bounce animation
Fix for background window when presenting second form sheet controller
Fix: application key window
Support invocation for strong properties
Setup static variables
Code separation
Update the doc concerning custom presented controller size