Nuke ReactiveUI-NLog, it's coming back as Splat-NLog
Remove RxUI 4 commands
No need for non-portable RxUI.Core
OAPHs shouldn't be IO<T>
Remove MemoizingMRUCache and ObservableAsyncMRUCache

The former has moved to Splat, the latter sucks and you should use Akavache
instead.
Merge pull request #454 from reactiveui/delete-old-stuff

Delete old stuff