Implemented basic GUI, if trying to add an InventoryItem object to the
database that already exists, the add () method redirects the call to
update ()
Added a method to delete the database, bug fixes, semi-functional UI.
Saving current broken branch
All major bugs have been fixed, project is fully functional as intended.
Can be considered complete.
Merge pull request #1 from jerryteps/test-branch

Merging completed test branch into master.