Accepting and processing dry_run together with --mongo-collection (to overwrite existing image record)
Support uploading multiple levels of pyramid
bugfix for wrong level stored in image chunks
Merge branch 'dev/dj-full-pyramid'

* dev/dj-full-pyramid:
  bugfix for wrong level stored in image chunks
  Support uploading multiple levels of pyramid
  Accepting and processing dry_run together with --mongo-collection (to overwrite existing image record)