Created a class that handles displaying the info to the console
Custom exception that is thrown the store attempts to process an empty
cart
Class created to handle the creation of a catalog full of Goods.  This
class implements ICatalog
Interface created to handle the finding of goods
Custom product not found exception.  Thrown if cart tries to find a
product that does not exist
Re-factored code removed calculateSalesTax method and moved to store. 
Now class just represents a real-world cart
Re-factored not the store calculates sales tax....calls a method to
write tot he console
Re-factored so this represents a single line of a transaction
Updated the tester to reflect changes
Refactored code in Store.java, Cart.java, Transaction.java
added ConsolePrint.java, EmptyCartException.java,
ProductNotFoundException.java, ICatalog.java, Hardcoded.java