Applied this recommendations: https://developer.apple.com/library/ios/#technotes/iOSStaticLibraries/Introduction.html
Added .pch file speed up compilation time.
Little typo fix.
Performed suggest Xcode project modernization.
Added iOS 7 resources to the demo project.

- new icon size (+ missing existing icon sizes)
- new launch images (+ updated iOS 6 images)
- a convenient screenshot mode setting
Added new Xcode shareddata.
Using iOS 7 text size methods, when deploying to iOS 7+.

- circumvents deprication warnings
Forcing zero label height when text is set to @“”.
Merge pull request #163 from jdg/iOS7

I os7 fixes