Added unit-tests for QuestionService and QuestionController.
Added integration tests for domain relations.
Updated domain classes.
Updated QuestionController and QuestionService.
Updated unit-test for QuestionController.
Removed AnswerController.
Implemented UserController.
Added unit-tests for UserController.
Added twitter-bootstrap and fields plugins
Generated main layout.
Generated pages for registration, adding question and viewing question list.
Fixed unit tests for UrlMappings and UserController.
Fixed typo in QuestionController.
Updated UserController.