Feature/add timeago

show issue timestamp

![2014-02-09 3 15 10](https://f.cloud.github.com/assets/608755/2117985/177f813e-90ed-11e3-9746-8c8038e36326.png)

![2014-02-09 3 15 48](https://f.cloud.github.com/assets/608755/2117982/10ae2856-90ed-11e3-8032-8f46b99a9f0f.png)