Memegen image inlining

Hey Steve,

we'd like to add image inline support for our new meme generator.

We have a series of sites for different languages, like www.memegen.com, www.memegen.de, ru.memegen.com etc. So the regex I implemented reflects that.

Here's a test post: http://www.reddit.com/user/Hakayati/
With the locally built RES, it seems to pull the image inline correctly.

We're automatically detecting content type and set the header accordingly.

Please let me know if I missed anything. Thanks for your work on this awesome extension!