Updated for Xcode 5 and iOS 7.0

1. I've updated the README to include information for both Xcode 4 and Xcode 5. Anyplace where the instructions were different I've broken apart the instructions so that both frameworks are supported.

2. I've updated the language of some of the related text so that it's more clear to read.

3. The major changes were related to Xcode 5 and how to add Build Phases. I found and reported a Xcode 5 bug (radar# 15178189) where options are grayed out if you don't click on whitespace below the Build Phases tab.