fixes xcode project setup guide link, removes incorrect-to-this-version note
adds version-correct settings setup guide
fixes popover content size for library view controllers at the size calculated after first presentation, which will be iphone 5 minus nav bar
fixes layer zposition of modally presented view controllers
RN for 3.1.2
v3.1.2
removes some cruft that crept into demo project file
merges in fixes to master
merges in latest fixes from master