Do not ToString() MgDateTime when outputting for GeoJSON. Use the MgUtils::DateTimeToString() utility function that already handles this for us.
Do not ToString() MgDateTime when outputting for GeoJSON. Use the MgUtils::DateTimeToString() utility function that already handles this for us.

Fixes #142

jumpinjackie/mapguide-rest,jumpinjackie/mapguide-rest,jumpinjackie/mapguide-rest,jumpinjackie/mapguide-rest