No more beta in release versions
Handle casts when trying to dig out member info

Fixes #659
Merge branch 'master' of github.com:reactiveui/ReactiveUI
Add a dummy XAML control to test design-time
Downgrade not finding a IPlatformOperations to a warning
Revert "Merge pull request #665 from sickboy/feature/IReactiveNotifyPropertyChanged_Fix"

This reverts commit 465399cd66fcf4627c062a92af3b9d8de3f9aeec, reversing
changes made to 4fe0e5c97105120b48a73d8cfd8e64c5d8014bb6.