Minecraft ready for prime time

Code-wise, Minecraft, without the visualization bits, is ready for master now.
Note that this branch introduces a new dependency to pycrypto, this will still have to be taken care of.

This solves: 
https://freeside.tessierashpool.net/jira/browse/RUN-14

For the dependency issue:
https://freeside.tessierashpool.net/jira/browse/RUN-13