*WIP* chest API
fix crash when player causes entityGone message
chests kinda working.

Problems to fix before merging:

 * withdraw breaks for more than 1 item
 * deposit breaks for more than 1 item
 * if you open a chest, close it, and open it again, the bot crashes
   with no error message.
 * when the chest has a negative x coordinate, it can't open
 * rename item.meta to item.metadata
rename meta to metadata

 * block.meta -> block.metadata
 * item.meta -> item.metadata
chest example: print messages on end and kicked
chest: don't emit redundant update events
remove debug statements
update README
Merge branch 'chest'
Release 0.0.16