Remove deprecated premultalpha prop
Cleaning up env var usage; adding OSGEARTH_CACHE_DRIVER envvar
DateTime: add ISO8601 output
DateTime: add constructor that takes ISO8601
Leveldb cache (WIP) - add support for purge, remove, compact, getsize, etc.
wip
wip
leveldb: cache all bins to the same database so we can control sizing across cache bins
Leveldb: some semblance of cache size capping
add tracker file
GeoTransform: fix a bug.
Fix TerrainCallbackAdapter to automatically discard dead callbacks
Merge pull request #2 from gwaldron/master

update 20140418