Modified:
	CustomerGenerator:
		Now has boolean myIsRunning. 
		Run() now based on how many customers can still be generated 
			and myIsRunning.
		Now takes in maximum number of customers as parameter
	Cashier:
		Now has boolean myIsRunning.
		Run() now based on myIsRunning.
	ServiceQueueManager:
		Now takes in the maximum number of customers as parameter
Added:
	CustomerGenerator:
		Stop()
	Cashier:
		Stop()