Merge pull request #325 from pmq20/master

Use Rails 4.1.4
Fix typo :grin:
Merge pull request #326 from haio/master

Fix typo :grin:
Upgrade auto-space
Merge branch 'master' of github.com:ruby-china/ruby-china
后台微调;
Github -> GitHub
某些错误的空格、拼写修正;
update _topic.html.erb to auto expire cache.
.
Wiki page style updated, auto-space upgrade 0.0.4;
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