Merge pull request #1 from djs55/master

Change 'vhd' dependency to 'vhd-format'
Merge pull request #2 from djs55/master

Correct typo (vhd-disk -> vhd-format) and re-release
Update to new xenstore interface in 1.2.2

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
ChangeLog -> CHANGES
Add Travis CI scripts
travis: +obuild
travis: install depexts
travis: correct order of depext
travis: install depexts from the opam depends, not the package (for which its a depopt)
install target shouldnt depend on build, or else 'sudo make install' fails
force build to unix, drop 3.12.1
Merge branch 'master' of git://github.com/mirage/xen-disk

Conflicts:
	CHANGES