Kalman filter

[RobMeades]

Raised from #135 on behalf of Michael Boeding.

Although this may not be the best place to put this, since it would be useful by itself not just with geofencing but the ability to take GPS coordinates and accelerometer readings to create a more accurate fix over time using a Kaman filter could be very useful. Especially for geofencing but as a separate component also for hardware that has access to accelerometer data. It would need to be able to ingest a standard format of data from the accelerometer.

https://robotics.stackexchange.com/questions/11178/kalman-filter-gps-imu