Made IBindingTypeConverter usable standalone (without registration with the DepdencyResolver) by outsourcing GetAffinityForObjects into derived interface IImplicitBindingTypeConverter

Extended Bind, BindTo and OneWayBind to take an optional parameter that allows the developer to pass in an ad-hoc IBindingTypeConverter which overrides any otherwise implicitly selected converter

Minor improvement to Logging Output generated by PropertyBinding
Made sure that MonoTouch Linker.xml preserves the full type for UIKit Controls and not just properties.
Tightened WrappingFullLogger code contract
Singleton via Lazy<T> for UIKitObservableForProperty to save memory
Implemented DateTimeNSDateConverter which converts between System.DateTime and NSDate to aid developers reusing existing view models
Refactored out IImplicitBindingTypeConverter
Added command action support for UIBarButtonItem
Fixed indenting
Changed RxApp._TaskpoolScheduler for IOS
Merge branch 'per-binding-converter-override' into rxui5-master
Fix this bug over and over again