This commit adds smmap2, which is a separate pypi package from the existing
smmap 0.9.0, though they both come from the same repo. It also moves smmap into
the new python modules location.

Also move gitdb and gitdb2 to the new python module structure.

Also moves GitPython into the newer python module folder structure.

This commit adds the python3 application truffleHog, which is a stand-alone tool
that scans a git repo for unencrypted passwords.

This depends on a newer GitPython, which depends on a new major version of
gitdb, which depends on a new major version of smmap, so I've packaged those
as well in the preceding commits.

…map2

truffleHog: init at 2.0.91