Modify MarkDown URL syntax: add rel="nofolow" and target="_blank" for untrasted URL

Trusted URL - on the same domain, or what ever you want, should ve started with "!"
like:
[1]:!/my-goods/article1.php (Some title text)

Untrasted -- all other URLs (without '!' at the beginnig)
Correct silly mistake in name of "nofollow" param. Add same feature for inline links.

Ie:
Look [this](www.some-site.ru) site.
- Will also be
... <a rel="nofollow" target="_blank" href="...">...</a>...