UK: media endpoint for formlist api, closes #520
UK: url for media files
UK: include DigestAuthentication in settings - common.py
UK: pep8 cleanup
Merge branch '520-media-files-access-fix'

* 520-media-files-access-fix:
  UK: pep8 cleanup
  UK: include DigestAuthentication in settings - common.py
  UK: url for media files
  UK: media endpoint for formlist api, closes #520