Fix warning: use tu for NSUInteger
Import UIKit for classes that refers UIImage

UIKit is set as dependency in the podspec, yet when
files are copied manually, it fails compiling.
Update cocoa pods version
Add code example written in swift to readme
Add comment in code example to clarify in which 
language it's been written.
Add a blank lines to enhance readability
Use latest version of cocoapods for travis
Bump version to 1.1.1