Change list-group style to no body padding
JS visible to no-creator behaviors
Chagne to font awesome
Post reply to js
Move markdown helper to post helper
Extract markdown helper; use Nokogiri for link_most_content
Init Notification model
post_topic notification
Post extract mentions methiod
skip post_topic notification for author and top floor
Add named scope for Notification
Create mention notification after create post
Skip mention nofitication for author