Linkable image support

[ajmas]

It would be useful to have linkable image support, as provided by some markdown implementations:

[![images](https://github.githubassets.com/images/modules/logos_page/GitHub-Mark.png)](http://www.githib.com)

When I do try it I end up with mangled content:

<a href="https://github.githubassets.com/images/modules/logos_page/GitHub-Mark.png" target="_blank"><img alt="images</a>" src="http://www.githib.com">

BTW this is supported by the markdown implementation used by Github, as demonstrated