mod_parrot Documentation

I've finally begun the process of writing detailed documentation for mod_parrot and publishing it on the mod_parrot wiki. Of particular interest are the shiny new roadmap and an architecture document for internal developers (about 80% complete). Once I finish the architecture doc, I'll get to work on the HLL module developer's guide and a user's guide.

This means that the mod_parrot page on the Perl Foundation wiki is deprecated. I'll most likely replace it with a link to the new page.