title: Is it possible to find and delete orphaned blobs in the app engine blobstore?
body: <p>I'm using the python api and have created a few orphaned blobs during testing.</p>
  
  <p>Because of a bug in the dashboard, I can't currently delete these, and in any case going forward I would like to be able to do this programmatically since it will be unfeasible to do it manually once the number of entities goes up.</p>