Refactors showcase sub-page metadata rendering

Before (in every showcase subpage) 

![image](https://cloud.githubusercontent.com/assets/302258/4581794/ea7207a6-4fe2-11e4-82fc-0db1a85ff734.png)

After refactoring

![image](https://cloud.githubusercontent.com/assets/302258/4581804/fc904a24-4fe2-11e4-96a8-9eee629d3e55.png)