Added AdminGUI panels
Edited PinLoader panel
Created two new receipts
Edited ReceiptPanel to prevent saving blank receipts
Changed ReceiptLoader to use JList
Finished editing ReceiptLoader
Changed constant value of RECEIPT_LIST
Changed PinEditor class to use JList
Changed JLists to use DefaultListModel.getSize()
Edited ReceiptPanel
More work on ReceiptPanel using JList
Added comments to the ReceiptPanel class
Changed MenuButton constructor to add an ActionListener, and updated
all effected classes.
Fleshed out ReceiptPanel class loadReceipt method
Edited spelling in comments
Finished ReceiptPanel I/O and changed Outside border to be part of 
SystemInit.  Added a lowered bevel border to GUI classes.
Moved data arrays back to the ItemPanel class.  Also added a
MouseListener to the ItemPanel so the user can return to the category
menu by right clicking.
Began work on serializing arrays to prepare for creation of
array editor option.
Added toMoney method to Tools class
Serialized category and item arrays to prepare admin editor class