Support reserved messages

Pass along the payload_type and handle reserved payload types gracefully so they can be handed off for further protocol processing (in the case of vendor specific).

Also added requirements for readthedocs to find udsoncan.

Re-release on PyPi Under new name

Finalized planned unit tests
Renamed from python-doip to doipclient
Finalized documentation

First push to pypi

v0.0.7

Update setup.py