be django 1.4 compatible

Signed-off-by: Richard Marko <rmarko@redhat.com>
move src/pyfaf/retrace.py to main package

It's required by action-c2p.

Signed-off-by: Richard Marko <rmarko@redhat.com>
drop kobo

Signed-off-by: Richard Marko <rmarko@redhat.com>