升级 Emoji 库，以修正某些表情无法转换出来的问题;
Merge branch 'master' of github.com:ruby-china/ruby-china
调整 Loading 动画的样式;
Add Twitter Timeline page.
Add tweets link in navbar.
Rails 4.0.3
更正错别字，fixes #245
Merge pull request #274 from diguage/master

更正错别字，fixes #245