manually merging gridNode code from @jpumpelly
Merge https://github.com/bmceldowney/crossroads

Conflicts:
	js/creep.js
	js/gridNodes.js
why did git get activated in Visual studio?
Fixed creep walk animations. Cleaned up some stuff.
the movement is divided into 2 steps & tweens.
2 Step movement now working with world wrap! Looks good!