Support for named images

[simov]

![something]

  [something]: http://i.imgur.com/GiLeftR.png

Should be rendered as image:

[tivie]

Should be implemented

[simov]

Thanks it covers all of my image test cases here.

I'm using my Markdown Chrome Extension to quickly check markdown documents whenever I stumble upon something interesting. Currently only two compilers are officially bundled with the extension but Showdown as well as 6 others are supported, you can check it out here if you are interested.

👍