Minor spelling fix.
Correct the terminology used in the value description? Both <http://gpsd.berlios.de/NMEA.html#_mwv_wind_speed_and_angle> and <http://www.tronico.fi/OH6NT/docs/NMEA0183.pdf> state that the "T" value means "True" not "Theoretical". It is assumed they don't disagree with the official, closed specification.
Minor typo fix.
Minor white space fix.
Add test for existing `MWV` sentence parser with supplied sample data.
Add (sub-optimal) support for generic proprietary sentences. This means we can easily skip any proprietary sentences without causing the parser to barf. The implementation is sub-optimal because I prioritised minimising the changes to the existing `parse` routine.
Add support for XDR sentence parsing. Still requires some additional documentation.
Don't include the talker in the XDR representation in order to match the other types.
Add documentation on the XDR/transducer-related classes.