Break player drawing to represent as sprite

... for sprite batch, so that everything can be viewed with the camera.
Nothing is working yet.

Everything is broken.
Map is moving one tile at a time.

It's just the player is gone.
EVERYTHING IS BROKEN
Remove necessary override decorator
Camera is showing something
Camera is showing map, player
prune dead code
Moving with camera

Still off-sync, but workable.
Simplified translate code
Everything is broken again.

This is starting to become a trend.
Fixed simplification of translate code

it used to be that the tests sort of failed when we were going backward
on the coordinate plane.  For example, for a displacement of -32, -32
would always be less than the step.  To fix this, I just added some
absolute values.
Removed dependency on separated position vector
More appropriate method call
Player moves tile by tile

The player can move tile by tile at any scale and at any speed.
Camera follows player

the follow is very choppy, but it's there
Camera follows player smoothly

Woohoo!!!
Merge pull request #12 from vermiculus/feature/map/move-with-player

Camera moves with player smoothly