Adding unit test for anki_vehicle_msg_get_version() function.
Updating src/protocol.h from include/ankidrive/protocol.h.
Adding missing ANKI_VEHICLE_MSG_C2V_SET_OFFSET_FROM_ROAD_CENTER_SIZE
macro.
Adding battery level request and response to protocol.
Adding four vehicle notification messages to protocol.
Correcting typo and removing trailing whitespace from comment.
Applying pull request comments from chapados to rename certain messages:
rename ANKI_VEHICLE_MSG_V2C_POSITION_SPEED
to     ANKI_VEHICLE_MSG_V2C_LOCALIZATION_POSITION_UPDATE

rename ANKI_VEHICLE_MSG_V2C_OFFSET_FROM_ROAD_CENTER
to     ANKI_VEHICLE_MSG_V2C_LOCALIZATION_TRANSITION_UPDATE

rename ANKI_VEHICLE_MSG_V2C_CAR_OFF_TRACK
to     ANKI_VEHICLE_MSG_V2C_VEHICLE_DELOCALIZED

rename ANKI_VEHICLE_MSG_V2C_CAR_AT_TRACK_EDGE
to     ANKI_VEHICLE_MSG_V2C_OFFSET_FROM_ROAD_CENTER_UPDATE
Merge pull request #16 from kloepper/protocol_extentions

Protocol extensions