fixed up comments in googlemap.py, moved region.js to web_assets
dump markers json out in one shot. Added marker comments.
comments clarifications and whitespace adjustments
nbt.py now simply *reads files*, nothing more
Initial commit of the AssetManager

Mostly a blind copy/past from world.py and googlemap.py.  Not runnable

Rewrite Tracking Issue: #565
Scan the FS to find RegionSets

Rewrite Tracking Issue: #568
Moved some more stuff from World to RegionSet

Also, fixed some syntax errors and other minor issues

Rewrite Tracking Issue: #568
skeleton outline of TileSet object and tileset.py created
Added in documetation for what options are accepted
More work on RegionSet and World

Rewrite Tracking Issue: #568
Merge remote-tracking branch 'origin/rewrite' into rewrite
Finished implemention of RegionSet.  not yet tested

Rewrite Tracking Issue: #568
first version of single-process dispatcher

tracker: Issue #564
Removed biome handling and north-direction

We'll have to figure out how/where to put it back in

Rewrite Tracking Issue: #568
Merge remote-tracking branch 'origin/rewrite' into rewrite
useBiomeData is a property of worlds

Rewrite Tracking Issue: ##568
started writing TileSet. put convert coords in util.py
dispatcher docstrings and first multiprocessing dispatcher

tracker: Issue #564
comments and docstrings for the multiprocessing dispatcher
some minor changes to allow multinode (!!!) dispatching

tracker: #564