Objective-C modernization
Make it a CocoaPod
Picker and Selection handle touch exclusively

This is because otherwise the dragging might interfere with gesture recognizers of the hosting view. This way one can i.e. check for `touch.view.isExclusiveTouch` in `gestureRecognizer:shouldReceiveTouch:` and cancel the gesture recognizer accordingly.
Merge branch 'master' of https://github.com/iOctocat/RSColorPicker into iOctocat-master
Use correct version for PodSpec
Merge branch 'iOctocat-master'
Update README to reference LICENSE