Replacing empty chunks that allocate lots of
memory with EmptyChunks that don’t.
Lowering the byte count for MapBlock and Chunk by 
removing obvious redundancies
realignes items, comments 404 triggering ones.
realigns items, removes commented.
adds a new 2D projection. makes code pep8 compatible.
merge from upstream master.
fixes things that returned to old status during merge.
merges contents of psidispatcher.py into spockplugin.py -- untested, unused.
Merges remote branch 'upstream/feature_ignore_airblocks' into branch minecraft.
Introduce a way to update individual blocks from
empty to non-empty in EmptyChunks
Merge remote-tracking branch 'upstream/feature_ignore_airblocks' into minecraft
a script for scraping block textures.
replace aspect_ratio by second visual angle.
replace Jonas' texture by the more complete block images from gamepedia.
removes utils.py because misplaced here.
removes code to save projections to file.
removes attempted ipython import.
Merge pull request #46 from policecar/minecraft

A 2D projection of the Minecraft block world and spalanzani's spock fix to ignore air blocks.