title: Deleting core data version xcdatamodel files
body: <p>I've created a versioned Core Data model in my iOS app, and it has several versions created so far (several .xdatamodel files within the .xcdatamodeld bundle). Before shipping the app, I'm considering deleting these old versions so I can start with a single clean data model - and data loss isn't an issue at this stage.</p>
  
  <p>Is this possible? And what would be the best way to achieve this without simply deleting all Core data files and recreating a new model.</p>