Added DossierDataExtensions containing useful methods.
Refactored DossierDetailController to use new extensions.
Refactored NoteController to make use of new extensions.
Added NoteDataExtensions containing useful methods.
Refactored MediaController to make use of the new extension methods.
Replaced method GetCurrentUser with the property CurrentUser.
Added documentation for the property CurrentUser.
Replaced calls to base.GetCurrentUser with calls to the CurrentUser property.
Added documentation for the UserManagerExtensions methods.
Merge branch 'feature/refactor' into develop.
Refactored controllers and added extension methods.