修改移动端分享功能Bug
	修改 tsina_question_path 函数名为 share_question_path
	合并 question.html.haml 与 _solution.html.haml
	删除 mobile/answers/_solution.haml.haml
	删除 mobile/questions/_social_buttom_links.html.haml

	modified:   app/helpers/questions_helper.rb
	modified:   app/views/answers/_solution.html.haml
	deleted:    app/views/mobile/answers/_solution.html.haml
	modified:   app/views/mobile/answers/correct.js.erb
	modified:   app/views/mobile/answers/wrong.js.erb
	modified:   app/views/mobile/questions/_question.html.haml
	deleted:    app/views/mobile/questions/_social_buttom_links.html.haml
	modified:   app/views/mobile/questions/show.html.haml
	modified:   app/views/questions/_question.html.haml