update View Web.config to use MVC 5
update SquishIt namespaces for Views
Remove Sanitizer.GetSafeHtmlFragment-call

Because it removes <pre>-Tags and makes the whole blog for source code
useless
Remove unnecessary Elmah.txt again
Remove useless web.config from project\Views-Folder
Configure Autofac to load also AdminController
Add Constant to make repositories switching easier