Reproduce #173 using rspec.
Replace user placeholder in code after markdown.
Merge pull request #174 from doitian/bug/173-user-placeholder-in-coffee

Bug/173 user placeholder in coffee
Add rpm.
回帖快捷键支持 Command + Enter; #176
gravatar_proxy 改回默认的 gravatar 官方地址
Exclude current topic from recent topics list of the node

Fixed #180
Update to Rails 4.
Fix test cases.
Fix assets complie.
Fix scaffold template for Rails 4.
Fix assets precomplie bug.
修正缺少的图片文件;
修正通知没有 updated_at 属性，导致 cache digest 计算错误的问题;
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Rails 4.0.0.rc2
Fix #181, Because the boolean type field define keyword has changed from  to .
Fix #92, 由于 @ 的通知发出于 follower 的通知不是在同一个生命周期(Rails 和 Sidekiq)，所以，之前 @Rei 设计的 notified_user_ids 临时存放发送过的用户编号会不起作用.
Not need JRuby test.
改进重复通知的解决方案;