unfavorite, unfollow.. 改成 delete method，去掉面包屑的代码;
Merge branch 'master' of github.com:ruby-china/ruby-china
Fix set_active_menu.
Split large method -> topics#show
Fix cpanel/site_nodes edit page.
remove notice_xxx methods, it was not need.
Fix #229 active Jobs menu, when it visit on a job page.