Added a button to add items in the navigation bar. Added titles to the navigation bar for the two screens.
Added edit button in the navigation bar (it already calls the selector to edit a table automatically). Removed the header in our itemsViewController - we'll just use the icons in the nav bar.
Few minor fixes in preparation for starting the bronze/silver/gold challenges. Basically just stuff I missed that weren't major.
Finished bronze challenge - change the keyboard of the value field to the number pad.