HangingEntity: Silenced a crash.

Vanilla worlds sometimes contain data that this was asserting upon. Changed into a log.
1.7 Protocol: fixed potential problems with no-payload packets.
1.8 Protocol: Fixed problems with no-payload packets.
Redstone: Fixed a crash with repeaters on a chunk border.
Merge branch 'master' into redstoneTests

Conflicts:
	src/Simulator/IncrementalRedstoneSimulator.cpp