SCIPAD-1681 Changes to make the navigation bar items work in a more standard fashion
SCIPAD-1681 Addeda category to know whether global navigation has already been added to a view controller so that the animation doesn't get messed up by re-adding buttons.
SCIPAD-1681 Updated some of the commenting for the delegate method for bar button items. Turns out you CAN pass the same button around in the latest versions of iOS, but only want to do so if they are staying exactly the same (if they move around, or a new one is added, they will 'pop' into place, so you would want to provide a new copy instead.)
SCIPAD-1681 Quick commenting add
Merge pull request #14 from walmartlabs-samsclub/feature/SCIPAD-1681-updated-navigation-bar-button-handling

Feature/scipad 1681 updated navigation bar button handling