Send player position messages

When a player's sprite is redrawn, notify the player agents that the
position of one player has been updated, but only if the grid
coordinates have actually changed.

Signed-off-by: Aharon Campos <aharoncampos@gmail.com>
Merge branch 'master' of https://github.com/cristopherson/BomberJade

Conflicts:
	src/BomberPlayerAgent.java