Bug#244971: incorrect (text/plain) mime type for new installer image

[Marc Horowitz <marc@mit.edu>]

Package: cdimage.debian.org
Version: n/a

http://www.debian.org/devel/debian-installer/

contains links to a bunch of iso images.  The two I checked:

http://cdimage.debian.org/pub/cdimage-testing/sarge_d-i/i386/beta3/sarge-i386-netinst.iso
http://cdimage.debian.org/pub/cdimage-testing/sarge_d-i/i386/beta3/sarge-i386-businesscard.iso

return responses with Content-Type: text/plain.  This is clearly
incorrect.  I don't know if there's a standard type for iso images,
but application/octet-stream would give the desired behavior on most
systems.

                Marc