Added support for Dynamic Types to BNRDetailViewController

The detail view controller will now update the font sizes if the user changes the font size for applications in system settings.
Updated Auto Layout to support changes in font size due to Auto Layout.
Removed rogue label from xib file.
Added support for dynamic type to the item view controller.
Added dynamic type support for the BNRItemCell
Pulled in backup of detail view controller XIB file to resolve AutoLayout discrepancies in the book.

There appeared to be some errata in this chapter w/ AutoLayout (or I missed a step).

Pulled in the saved xib file to resolve the auto layout issues.