DISQUS integration for commenting

[obaltzer]

We want to support commenting on individual pages. The easiest way of doing this would be to use DISQUS until we can add commenting support to Gollum.

[boddhisattva]

@obaltzer - Any pointers on how can one integrate disqus with gollum, I've tried adding them to the custom mustache templates but they don't seem to load. I've even tried defining them in my custom.js but all in vain so far.