Stable release with WDT

This version has been running over a month without locking up, I think the watch dog timer helps a lot. This is compatible with MoteinoMega, but I don't have it running on that yet, just the normal Moteino.

Fixed wind direction but

Wind direction could go to -1, but with an unsigned integer this was about 65k.

Improved rain rate and fixed a few bugs

Get rain rate (inches per hour) from the Davis ISS instead of calculating it in the sketch. Also get 10 minute wind gust from the ISS also. Average wind direction was fixed, it now uses vector math to calculate the average direction.

Initial Release

First release. Everything seems to work fine.