修复题集在登陆与未登陆情况下的显示问题
	modified:   app/views/classifies/index.html.erb
	modified:   app/views/static/home.html.haml
题集链接样式问题修改
	modified:   app/assets/stylesheets/application/classifies.css
	modified:   app/views/classifies/index.html.erb
Merge pull request #59 from ProgrammerYuan/master

修复题集在登陆与未登陆情况下的显示问题