Added map-reduce script for averaging over grid
Added map-reduce script for averaging over grid

Safecast/GeoSense,Safecast/GeoSense,nickbenes/GeoSense,nickbenes/GeoSense,nickbenes/GeoSense,nickbenes/GeoSense,nickbenes/GeoSense,nickbenes/GeoSense,Safecast/GeoSense,Safecast/GeoSense,Safecast/GeoSense