Add 2013 to copyright year range.
Use the -Wextra flag.
Allow Xcode to update the project config.
Allow Xcode to upgrade the XIB format.
Convert the Cocoa example to use ARC.
Clean up ivar/property usage in Cocoa example
Use instancetype in Cocoa example init methods.
Clean up ivar/property usage in Cocoa example.
Convert to modern Obj-C syntax in Cocoa example.
Use a block callback for Cocoa style parse errors.