Swift3 and minor improvements

• UIDevice: add new iPhone and AppleWatch devices.
• UIColor: init function now forces the RGB values to be between 0.0 and 1.0.
• UIImage: resizedImage functions now return an optional object.
• Minor GET_DATE function improvement.
• Update README with examples written in Swift 3.

2.2.3

• Print a warning if a localized string can't be found.

2.2.2

Fix crash on GET_STRING

2.2.1

Fix carthage deploy