Update Game.h to include missing class

[prestoncarman]

Missing include of vector class.

[krs-world]

Game.h? I dont see that include file in our distribution..

GameGrid.h uses vector, but is included in Grid.h, which is part of that include file

[prestoncarman]

I have an assignment that uses the Game data. As part of the assignment, I am giving the students the game data in the form of a Game object provided by Bridges. When the file is included directly, the Game class has a private member variable of type vector, but does not include vector. This causes a error when no other files include vector.