Update to mousetrap v1.4.5.

This fixes a bug present in Safari that would cause the 'v' hotkey to be
inserted into the address bar when opening an article.
fixed swanson/stringer#281

it's to avoid infinite loop of redirects
Added Arch instructions to VPS.md

* Added list of needed Arch packages
* Added Arch specific instructions 
* Switched to using useradd instead of adduser as it is more distro agnostic (adduser is not
* Instructed users to always use '-l' switch when they 'su'
Fixed Typo
配置好开发环境
配置rbenv
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