Fix unicode errors with bzrlib.
bzrlib is even more janky than I thought with regards to its treatment of

strings--it expects repository locators to be str objects with ascii encoding.

This means, I believe, that if you had a unicode path on your filesystem, you

couldn't have a bazaar repository in that path.
Encode all the things before passing them into bzrlib.

Ran unit tests. Some bzr things are failing for other (configuration/setup)

reasons but there are no more unicode/string errors.