Use the iOS 7 hierarchy rendering methods instead of renderInContext:.

This is a work in progress and needs to be conditional to support iOS  5/6 and also 7 at the same time. I don't have time to do this tonight but I will put together a release tomorrow with it.
Conditionally use either renderInContext: or drawViewHierarchyInRect:afterScreenUpdates: to capture the view screenshot.
Updated podspec for 1.1.
Merge pull request #2 from shinydevelopment/ios7renderingbug

Fix iOS 7 rendering bugs caused by using renderInContext: