修改Mobile分支代码
	modified:   app/controllers/answers_controller.rb
	modified:   app/controllers/application_controller.rb
	modified:   app/controllers/mobile/answers_controller.rb
	deleted:    app/views/answers/_fake.html.haml
	renamed:    app/views/mobile/answers/correct.js.erb -> app/views/answers/correct.js.erb
	deleted:    app/views/answers/fake.js.erb
	renamed:    app/views/mobile/answers/wrong.js.erb -> app/views/answers/wrong.js.erb
	deleted:    app/views/mobile/answers/_fake.html.haml
	modified:   app/views/mobile/answers/_solution.html.haml
	modified:   app/views/mobile/answers/correct.js.erb
	deleted:    app/views/mobile/answers/fake.js.erb
	modified:   app/views/mobile/answers/wrong.js.erb
	deleted:    app/views/mobile/questions/_linked_question.html.haml
	modified:   app/views/mobile/questions/next.js.erb
	deleted:    spec/controllers/mobile/questions_controller_spec.rb
	deleted:    spec/helpers/mobile/questions_helper_spec.rb
	deleted:    spec/views/mobile/questions/questions.html.erb_spec.rb