removed some code

- I removed some ViewModels where I didn't see a connection to the API.
I think we would be better off, if we were to create ViewModels with
actual functionality (or commented/annotated dummy functions).
Merge remote-tracking branch 'origin/dev' into dev

Conflicts:

	SparklrForWindowsPhone/SparklrForWindowsPhone/Helpers/MessageItemTemplateSelector.cs
	SparklrForWindowsPhone/SparklrForWindowsPhone/Pages/ViewPost.xaml