Fixed controller movement

made it more like outerra.  Also added earth position.
Added planet radius and position

Updated code to use planet's radius and position in a somewhat proper
manner.  Also implemented the new speed in walking.
Raw nasa height data

Gathered from nasa's site at:
http://visibleearth.nasa.gov/view.php?id=73934
added raw normal map for earth

8bit png (no height) gathered from:
http://poniesandlight.co.uk/notes/creating_normal_maps_from_nasa_depth_data/
Fixed issue with large file size limit.