Raspberryjammod

- update installer
- add earth.py script
- add colors.py utilities (designed for 1.10.2)

- scripts ported to dual Python 2/3 compatibility
- alpha test quality on the script side; same stable mod

Fix major bug in mcpi/minecraft.py introduced in 0.76

- fix events.block.hits() in read-only mode

- modify security system slightly (installer doesn't have mcpi/security.py, to prevent overwriting; instead, there is mcpi/security-template.py)
- add Python 3 to installer

Fix Minetris next block handling.