make compelling example even more compelling
Merge pull request #580 from dlech/patch-1

make compelling example even more compelling
Merge branch 'pr-578' into rxui6-master
Remove NuGet dependency on Newtonsoft.Json.
Merge pull request #583 from reactiveui/xaml-newtonsoft-ref

Remove NuGet dependency on Newtonsoft.Json.
Make events do The Right Thing automatically when awaited

Consider the following (incorrect) code:

    await myWindow.Events().KeyUpObservable;

This code deadlocks because we're awaiting an Event which will never complete.
This PR overrides the awaiter, so that if *and only if* you directly await the
event, you will get an implicit Take(1).  This means that existing code won't
break:

    // Since the return type of Select isn't SingleAwaitSubject, our rigged
    // awaiter doesn't apply, they get the default one.
    await myWindow.Events().KeyUpObservable
    	.Skip(2)
	.Select(x => x.Key);
Merge pull request #586 from reactiveui/event-awaiter

Make events do The Right Thing automatically when awaited
Rename RxCmd Creation methods to be clearer
Fix up names in ReactiveUI
Fix using statement for SingleAwaitSubject
Merge branch 'rxui6-master' into cmd-overloads
Update the tests
RIP GTK+
Eviscerate ReactiveUI.Platforms
Rename what's left to ReactiveUI.Winforms
Rename some project files
Rewrite all of the csproj files
Update XS Solution file
Fix up dependent references
Fix up Xamarin build