Added Altitude, depth, and geoJson

geoJson and KML have options to include altitude, so why not.
Altitude is given from ground or 0 (rel or abs) to the approx Exosphere (6200mi). 
Depth is given from sea level to -35994 (deep as the Pacific Ocean goes).
Merge pull request #40 from johnsonnc/develop

Added Altitude, depth, and geoJson