Doipclient

Fix SSLContext bug - thanks sfaiss

HarshaLaxman added `get_entity` method which can serve as a mechanism to discover ECU's in addition to the existing `await_vehicle_announcement`. Only supports IPV4 over broadcast for now.

sfaiss fixed some issues with the existing DoIP over TLS implementation and added some examples to the documentation. Updates the `use_secure` flag in the constructor to accept an SSLContext in addition to the existing True/False flags.

Also resolved an issue where PyPI wasn't rendering the README.rst properly

stefankopf found an issue where responses to Alive checks detected while handling another message would get delayed.

ISO-13400 requires TCP not UDP for Alive Check. Fixed by bongyongchoi . Released as 1.0.7

Resolve await_vehicle_announcement issue with possible state machine confusion with bad packets. Adds experimental support for IPV6 multicast.