Создал файлы фабрики вьюшек и тест. Добавил интерфейсы состояний вопросов.
Merge branch 'master' into QuestionViewFactory

Conflicts:
	QuizPlayer/libqp/libqp.vcxproj.filters
	QuizPlayer/libqp/libqptests/libqptests.vcxproj.filters
Поменял объявления классов для использования с визитором.
Merge https://github.com/alexey-malov/ood2014kurs into QuestionViewFactory

Conflicts:
	QuizPlayer/libqp/IMatchingQuestionState.h
	QuizPlayer/libqp/IMultipleResponseQuestionState.h
	QuizPlayer/libqp/ITypeInQuestionState.h
	QuizPlayer/libqp/MatchingQuestionState.h
	QuizPlayer/libqp/MultipleResponseQuestionState.h
	QuizPlayer/libqp/libqp.vcxproj.filters
Реализована фабрика вьюшек.
Merge branch 'master' into QuestionViewFactory
Merge branch 'master' into QuestionViewFactory

Conflicts:
	QuizPlayer/libqp/libqp.vcxproj.filters
	QuizPlayer/libqp/libqptests/libqptests.vcxproj.filters