Added deltas to the World alongside the actual state.
Better naming for World.find delta methods and more consistent dict copying.
Merge pull request #31 from mfajer/world_deltas

World deltas
Use cRecv when availible
Added skadi.engine.dt.cRecv module
Removed profile directive from cRecv
Merge pull request #34 from bluepeppers/master

Converted skadi.engine.dt.recv to cython
demo io reads instead of seeking
demo permissive about underlying io 'tell'
Adding Chat message type reverse enum.