Revert "Being more explicit about it when we're cloning arrays"

This reverts commit 6e470d6ba35eace1b51fbc3e0cc37ae6d30b4686.

I don't _really_ want to do this, but the performance hit of using
Lodash to clone arrays is too significant (about 12%).  Live and learn,
etc., etc.

Conflicts:
	src/main/coffee/engine/world.coffee
	thisbranchsucks.txt