Revert "Explicit setup.py packages"

This reverts commit 76c6c3ebb0482ca07e08a6c9485d97c4c1f31f9d.

It was a nice idea but doesn't play well with the vendor/ directory (or parser/).

Explicitly listing all of those isn't worth being "clean".
Re-add find_packages
Have Travis try to catch setup.py shenanigans
Changelog re #140, plus 0.8.1 release
Cut 0.8.1