New link syntax

[John Gruber]

Daniel Axelrod <markdown at danonline.net> wrote on 03/30/04 at 11:19p:

> [big self-snip]: An example of civility not generally seen outside this 
> discussion list.

Just for the record, Markdown turns the above line into:

    <p>[big self-snip]: An example of civility not generally seen
    outside this discussion list.</p>

I.e., the parser is precise enough to recognize that that isn't a
link definition, even though it starts with `[...]: `.

-J.G.