Add version information to component page if present

Reviewer: @addyosmani 

![screen shot 2014-10-15 at 9 37 10 am](https://cloud.githubusercontent.com/assets/238208/4664690/d3a1f80c-5545-11e4-9602-aa8ec5196053.png)
![screen shot 2014-10-15 at 9 37 15 am](https://cloud.githubusercontent.com/assets/238208/4664691/d3a49d32-5545-11e4-8e38-93a35bdd8b22.png)