Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Block patches

# gpg: Signature made Thu Apr 30 19:51:16 2015 BST using RSA key ID C88F2FD6
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>"

* remotes/kevin/tags/for-upstream:
  Enable NVMe start controller for Windows guest.
  MAINTAINERS: Add qemu-block list where missing
  MAINTAINERS: make block layer core Kevin Wolf's responsibility
  MAINTAINERS: make image fuzzer Stefan Hajnoczi's responsibility
  MAINTAINERS: make block I/O path Stefan Hajnoczi's responsibility
  MAINTAINERS: split out image formats
  MAINTAINERS: make virtio-blk Stefan Hajnoczi's responsibility

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