addressed compilation errors generated by the mass exodus of code from
the former QuizServer (now QuizControllerImpl) to the new class
QuizModelImpl. Constructor sends the two int parameters to
QuizModelImpl's constructor. Changed variable names to getter calls for
fields moved to QuizModelImpl. New QuizControllerImpl member field
created.
New class & interface created (QuizModelImpl & QuizModel). All code from
former QuizServer & QuizService (now called QuizControllerImpl &
QuizController) except playQuiz() and startGame() moved to this class &
interface. Two new getters (getNoOfAnswersPerQuestion(),
getTotalNoOfQuestions()). Visibility from private to protected for
keepScore(String, int), makeListOfQAndALists(), shuffleAnswers(int).
committing/pushing everything from this package (which is still heavily
under-construction) for good measure.