Feature Request External label resolution

[Lou Quillio]

>  Suppose that markdown was clever enough to reference an external

>  file (in .markdownrc of course) for the resolution of LABEL.

>

>  NOW when I re-arrange the universe, I only have to change the reference in

> this one file, NOT in every file that references it.


Good idea to tokenize URL paths and what not, but it isn't Markdown's
job to transform them for you ;).  You'll want to pre-process those
with your own script, then do your Markdown transforms.

LQ