Keep all locations in the _entities dict
Made World.on_draw() check for None. Fixed formatting
Fixed formatting issues
more formatting issues
Final formatting issues
Merge branch 'kylelin47/dictionary'. Fixes #3
Add guideline about newlines at end of file
Rotate the cursor image to point right
Change to using sprites everywhere; fix rotation

We added a directional property to Entity which specifies whether the
entity's image should rotate when it moves.
Merge branch 'kalgynirae/rotation'