Move to a generic configuration format
Avoid passing the 'game' keyword argument to the Arena constructor
Support running the simulator in the foreground
Decrease the physics iteration count

This helps to alleviate some performance issues.
Correct the wall marker numbering

This brings it in line with the diagram in the rules.
Implement robot marker detection
Marginally decrease robot size

This makes the collisions more accurate to the sprite.
Check motion blur by velocity

Previously we ran estimating velocity by motor power. Now we can use the
actual speed.
Merge pull request #5 from prophile/generic-config

Generic config