Updated project build settings to use those recommended by the Xcode 5 project templates.
Switched to new ENABLE_NS_ASSERTIONS build setting for disabling assertions in App Store builds.
Updated template icon.
Switched to asset catalog for app icons.
Switched to asset catalog for launch images.
Updated project and target build settings to use those recommended by the Xcode 5 GM project templates.
Added separate app icons for debug and ad hoc build configurations.
Updated install script to delete the install directory if it already exists.

The install directory must be deleted in case any files have been
removed from the templates.
Merge branch 'Xcode-5-Update'