Support more social links

#21 

This theme now supports following profiles

* github
* linkedin
* stackoverflow
* twitter
* soundcloud
* pinterest
* vimeo
* behance
* codepen
* foursquare
* reddit
* spotify
* dribble
* dribbble
* facebook
* angellist
* bitbucket
* skype

![screen shot 2014-12-21 at 1 07 34 am](https://cloud.githubusercontent.com/assets/1861842/5516059/ccd390f8-88ad-11e4-9b20-5ce36564edf4.png)