v0.5.0

• Performance increases exposed as "fast mode":
  • appends ECU count to the end of each fast-capable command
  • re-runs previous commands with "\r\n" returns
• Manual protocol selection via the protocol kwarg in OBD constructor
• OBD.get_port_name() has been deprecated, use OBD.port_name() instead
• Added internal ECU map and message filtering
• Decoders may now process multiple messages per OBDResponse. New decoder format:

def <name>(messages):
    # process message(s)
    return (<value>, <unit>)

• Replaced Message.raw with Message.raw()
• Added Message.hex() for compatability with old decoder format
• Changed behavior of the noop() decoder to pass raw data.
• Added drop() decoder to return None and trigger null OBDResponses
• OBDResponse.message --> .messages, now carries a list of Message objects
• OBDCommands no longer carry a supported flag. Use OBD.supported_commands or OBD.supports() instead.
• obd.scanSerial() is deprecated, use obd.scan_serial() instead