Fixed OldSkoolObsevableExtension to pass tests and renamed it to be the standard extension for this branch.
Refactor BindingToObservableWrapper.
ObservableMvxSourceBinding can be internal.
Update MvvmCross -> 3.1
Add repositories.config.
Android Sample: Compile using latest Android SDK.
ObservableMvxSourceBinding: Fixed a bug that would prevent the current value from being observed. Added unit test.
Fixed a typo, made a unit test run quicker.