Some inertia and a change of face

Just after some work this morning I have added some inertia as requested by some players though if moving at a certain speed or direction, the player may be stuck but can stop it by accelerating to another angle. The player 2 sprite has also received a new face lift and is green to be easier to see.

EDIT: I went and further reduced the acceleration and overall speed to give more of the illusion of inertia having an effect on the player sprites and also reduced the time till the lasers being fired are destroyed.