Added social media links and contact us link in footer.

Title says it all. Just stole Arnaud's styling from the KA Lite central page. Contact us is a mailto:info@learningequality. Social media icons point to FLE pages instead of KA Lite. 

![screen shot 2013-09-16 at 5 57 58 pm](https://f.cloud.github.com/assets/1319950/1154073/3abcba34-1f34-11e3-8231-ba05bfd14a58.png)