Re-drafted Interface
Added test to test add and availableQuizzes method
QuizServer passes new test
Added test for getQuiz method
Extended testGetQuiz method to test for a quiz which doesn't exist.
Now passes testGetQuiz()
Added test for submit() method, and adapted interface
commented out part of test that relays on the closeQuiz method being written.
Now passes testSubmit()
added tests to testCloseQuiz() & included extra part of testSubmit()
QuizServerImpl passes new test, added a new method to QuizServer
expanded testCloseQuiz() to check if scores are returned
passes new testCloseQuiz()
Added testCloseDeadQuiz()
changed comments in interface
Passes testCloseDeadQuiz()
Added testCloseFakeQuiz()
pases Added testCloseFakeQuiz()
Changed comments
Added testGetScores()