create MPSPrinterList object
add locationManager and printer access function to MPSPrinterList
add MPSPrinterList to all controllers that need printers
pass down MPSPrinterList down to controllers that need them
make app use MPSPrinterList
get rid of code that is no irrelavent with swtich to MPSPrinterList
change casting
make locationManager a property in MPSTabController
access locationManager and printerList in TabController without using NavigationControllers
remove old code passing printerList and locationManager to child controllers through navigation controller
make storyboard use uinavigationcontroller instead of listnavcontroller and mapnavcontroller
remove listNavController and MapNavController
get rid of imports of nav controllers
rearrange files
give credit to tutorial