Administrator authentication page
Merge branch 'backend-new' of https://github.com/StickMen/KungFuRhino into backend-admin-ui

Conflicts:
	YouDeliberate/Controllers/AccountController.cs
Temporary adjustments on views for visibility
Created ViewModels for Narrative and CommentAudio.
Temporarily edited AdminController functions to use the new ViewModels.
Moved other ViewModels to the new ViewModels folder.