fix collision checking code
fix health code

-wolf was inheriting wrong health object.
-wolf wasn’t initializing health
-named health’s init function wrong.
-removed the code to remove the sprite on death because it doesn’t work
reenable axe collision code

-move the code to remove the axe into a function so I can call it when
it collides with an enemy.

there is a bug with it currently that causes the remove to fail.  I
will have to look into it later.