修改移动端逻辑2
	modified:   app/controllers/answers_controller.rb
	modified:   app/controllers/application_controller.rb
	modified:   app/controllers/mobile/answers_controller.rb
	modified:   app/controllers/mobile/home_controller.rb
	modified:   app/controllers/mobile/questions_controller.rb
	modified:   app/controllers/questions_controller.rb
	modified:   app/controllers/static_controller.rb