Added awwni.me upload plugin

This allows MoeBot to upload images to redditbooru.
At this point, repost checking is not done here (there is a separate plugin for this, so I see no reason to add it as well), so it just forces the image/album upload to redditbooru (dxprog said this was cool).
The format is: !rb "\<optional album title\>" \<1 or more images\>
When provided with a single image, the album title will be ignored by redditbooru, instead returning just the rehosted image.