bibdocfile: application/octet-stream by default
bibdocfile: application/octet-stream by default

* When streaming a file, if the mime-type to provide in the
  response HTTP header can not be guessed from the file format,
  use "application/octet-stream" instead of "text/plain", to
  force browser to download the file.

tiborsimko/invenio,inveniosoftware/invenio,tiborsimko/invenio,inveniosoftware/invenio