Merge pull request #12 from xtdz/master

Updating Merge
Add Hidden Attribute to QuestionSets
	modified:   app/controllers/classifies_controller.rb
	modified:   app/controllers/mobile/home_controller.rb
	modified:   app/controllers/static_controller.rb
	modified:   app/views/new_admin/question_sets/_form.html.erb
	modified:   app/views/new_admin/question_sets/index.html.erb
	modified:   app/views/new_admin/question_sets/show.html.erb
	new file:   db/migrate/20141106215252_add_hidden_to_question_sets.rb
Merge pull request #110 from ProgrammerYuan/add_hidden_to_question_set

Add hidden to question set