ENH add bazaar

superceded by #53, have left in (rather than updating) as the comments are still relevant/unanswered.

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tentative bazaar support.

I'm not a bazaar user so if anyone can shed some light on the correct way to do revisions [that'd be great](http://i933.photobucket.com/albums/ad172/B5Erik/garycoleas-bill-lumbergh-in-office-space-20th-century-fox.jpg), at the moment I've left it them out which is certainly incorrect.

(Clearly we need some more testing with respect to revisions, it's on the roadmap.)

*I wanted to post this as a guide to demonstrate how to add additional vc support.*