Some cleanup
Merge pull request #613 from MarcinSc/multiplayer

Fixed shapes and texture coordinates for cable.
Simplified chunk load/unload process, removing the "ready" check on surrounding chunks.
Fixed deflate to happen before chunks being marked complete.
Added a system to detect problems with chunk load/unload events.
Fixed some bugs introduced with the cleanup.
Merge branch 'multiplayer' of git@github.com:MovingBlocks/Terasology.git into multiplayer
Adding screwdriver.
Merge remote-tracking branch 'upstream/multiplayer' into multiplayer