title: iOS App Version Upgrade - Does Bundle content get deleted?
body: <p>Looking for some concrete detail on how version to version upgrade works in iOS, specifically what happens to bundle content that has been removed in the new version? For example, if version 1.0 has a file called "foo.png" in the bundle, but version 2.0 does not, does iOS remove the existing foo.png during upgrade? Or does it leave it there? Thanks, alex</p>