Added more features

- Requested Qwizzles have now been fetched from the web service
- A Requested Qwizzle share the same view when taking a Qwizzle
- Delete the requested Qwizzle after it has been taken
- The refresh button returned
- Changed the activity indicator to use the network activity instead
- Added requestID attribute to the QuizSet class, it is needed for
deleted taken requested Qwizzle
- Login now also stores the user's name
- Removed hard code section indicating who is the request sender