Catch exceptions from ExecuteAsync.
Don't set the scheduler in a test runner in Xamarin.Forms
Merge remote-tracking branch 'origin/pr/701'
Fire onChanging too on OAPH
Write a test to make sure this works
Merge pull request #703 from reactiveui/oaph-changing

Make ToProperty fire Changing as well as Changed
Mono doesn't ship Rx anymore, switch back to NuGet for Xamarin.Mac
Version bump to 6.0.4