Add source properties for n2k stuff
Add vessels.mmsi path info

Conflicts:
	README.md
Add validation services (command line, validate function, Chai assert) as a npm module

Conflicts:
	README.md
Add/change current.drift|setTrue|setMagnetic
wind.speedTrue to wind.speedOverWater
Remove old current stuff
Add log and logTrip
Add yaw
wind.speedTrue
Merge pull request #27 from SignalK/n2k-signalk-integration

Changes related to n2k integration: additions and changes in the schema include 
- source properties for n2k message origin: pgn and src
- current
- log, logTrip, yaw