Return [Deleted item] from comment_title if commentable deleted

Fixed #3
use the same avatar on profile page and other pages
Merge pull request #8 from horx/master

use the same avatar on profile page and other pages
User touch callback for topic hot update instead of method
Add locale to cache
Delete likes after likeable trash
Fix topic hot accuracy
remove unuse has_many like_topics associations
Set dependent destroy for topics and comments

Use topic and comment callback to clearn likes and notifications.
Add user avatar in all list-group-item
Better topic default page and anchor, work with visited style
Fix #9 timing attack
Add access_limiter for session controller prevent password guess
Add nfs sync folder, for performance
Add host config for LiveReload
Fix comment create SJR with replaceState
Shorter reset token ttl
Update rails to 4.1.0.rc1
Edit navbar-toggle style
Add missing locales