Added collision handling

gGameEngine checks what kind of objects are colliding and handles accordingly.  Teleporter not operational, and I think it's because the screen does not center on the player and that is what the teleporter class changes.  I think.
Added Teleporter check

If player moves over 100 units away from the last encountered teleporter, then they can teleport again.
Add util.js

Also uncommented the settings stringify from entity.js
Map drawn correctly

Player spawns and the map is drawn centered on his position.  Right now, however, this is set for my screen size and the call to sync it with the canvas/window size isn't working afaik