Moving now uses up energy.

Doesn't actually do anything other than print but gives a good
start for changing the sprite based off of the energy levels, for instance.
Change current animation based off of energy levels.
Die and reset when you run out of energy.
Merge pull request #1 from blueheaven/change-animations

A full set of animations based off of the player's energy levels.
Modifications to only show the path we've taken, not everything we've seen.
Merge master into this branch.