created ColorViewer project
added a basic controller
prettyfied UI by using a NavigationController
added ColorDetailController
added minimal tab controller
made TabBarController useful by giving it two tabs; however, the title of top_controller changes back to the default (Detail) when any action is taken--this issue has been raised in the pragprog forum for the book
added option to change color; works fine in top color, not sure why it appears in the default colors