Added widget for social buttons

I've moved also helpers and specs for the social buttons. 

![screen shot 2014-11-03 at 10 15 20](https://cloud.githubusercontent.com/assets/1152640/4880335/fc53828c-6339-11e4-8cf2-b4afd041cc4d.png)

We could use the ellipsis character (…) instead of three dots