Move test UIButton class into its own file
Add unit tests for UIControl+RACSignalSupport
Refactor UIControl+RACSignalSupport
Refactor UIGestureRecognizer+RACSignalSupport
(Failing) tests for UITextField and UITextView support
Fix initial value in UITextField+RACSignalSupport
Refactor RACDelegateProxy to be suitable for public use
Remove RACEventTrampoline
Refactor UITextView+RACSignalSupport