Support ocaml 4.00.1 by defining (|>)

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
The grant table bindings are now in ocamlfind xen-gnt{,.unix}

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Regenerate OASIS

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
travis: install 'xen-gnt' rather than 'gnt'

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #7 from djs55/update

Update following ocamlfind rename to 'xen-gnt'