Added support for UIRefreshControl Command-Binding
Fixed crash when a KVOObservableForProperty based binding was disposed
Implement event based command bindings in a data-driven fashion
- Consolidated TargetActionComandBinder functionality into UIKitCommandBinders
- FlexibleCommandBinder and UIKitObservableForPropertyBase now support derived types as well (Bug)
Affinity handling improvements for FlexibleCommandBinder and UIKitObservableForPropertyBase
Fixed crash caused by unnecessary cast  in FlexibleCommandBinder
Merge remote-tracking branch 'origin/binding-enhancements' into rxui5-master