Update J\GitHub for latest GitHub API changes

The GitHubbers just added some new cute features to their API. Please read the [corresponding blog post](https://github.com/blog/1498-file-crud-and-repository-statistics-now-available-in-the-api).

I only have one problem implementing the [file delete method](http://developer.github.com/v3/repos/contents/#delete-a-file) ;(
From what I can see, it requires a body to be send with the DELETE request which is not supported by our current API (but could be).

Now, searching for info on this topic, I found very controversial opinions.
Reading the specs in [this document](http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-19#section-6.7) (which is a draft) states that:
>Bodies on DELETE requests have no defined semantics.  Note that sending a body on a DELETE request might cause some existing implementations to reject the request.

Advice please ;)