Merge remote-tracking branch 'remotes/kraxel/tags/pull-seabios-1.8.2-20150617-1'...

update seabios to release 1.8.2
add vgabios for virtio-vga

# gpg: Signature made Wed Jun 17 08:34:22 2015 BST using RSA key ID D3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"

* remotes/kraxel/tags/pull-seabios-1.8.2-20150617-1:
  update seabios and vgabios binaries
  tag our seabios builds
  update seabios submodule to release 1.8.2

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>