Fixed bug in simulate.py + hacky fix for bug in vixen

simulate.py wasn't setting the "gameID" variable correctly,
meaning all games were logged to "red.vs.blue.1.1"

Bug in vixen found by [SLX]; it attempts to move outside the board.
Usually when losing.

Path finding algorithm (path.py) shouldn't move outside the board.
But somehow it is.

Hacky fix at the moment by checking for moves outside the board in
vixen's score calculation, and allocating -100 to these moves.