Merge pull request #21 from rob42/master

Added sensors, design data, and anchor data
Change concepts: angle always from the bow, direction from north. Add directionMagnetic and angleTrue
Merge pull request #23 from SignalK/wind-angle-direction

Wind angle & direction
Indent with 4 spaces
Merge pull request #24 from SignalK/fix-indent

Indent with 4 spaces