Remove iOS 6 warnings
Merge pull request #73 from Threadflip/iOS-6

Remove iOS 6 warnings
Overwrite UIWindows's standard rootViewController getter for iOS 7 status bar handling
Merge pull request #78 from scheinem/master

Overwrite UIWindows's standard rootViewController getter for iOS 7 status bar handling
Merge commit '8d2a565b7b70748b97de60f9d3e247652248c1c3'