Added comments to the InventoryList class.
Added Comments to BackEndMain

Moved code for getAllParts from BackEndMain to InventoryList
Created blank Customer and CustomerList Classes
Removed unused Classes
Merge pull request #14 from SpyMaster356/GUI

Added Comments to BackEndMain
Moved code for getAllParts from BackEndMain to InventoryList
Created blank Customer and CustomerList Classes
Removed unused Classes