imgur module for Willie

This module analyzes all imgur links (i.e. _(http(s)://)(i.)imgur.com/*_) that are caught by Willie.

The imgur API is a little confusing when it comes to analyzing the ID of a resource, because this ID is not unique and can match different resources. For example, it is possible, and actually likely, that an image that was uploaded to the gallery (imgur.com/gallery/id) has the same ID as an image that wasn't (imgur.com/id).

The behaviour of the API is explained quite a bit in the docstring for the imgur function.