Add xentropyd.0.9.1

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
xentropy depends on ocaml 4.01.0+ for |>

Signed-off-by: David Scott <dave.scott@citrix.com>
xentropyd.0.9.1: improve docs (and retrigger travis)

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #3269 from djs55/xentropyd.0.9.1

Add xentropyd.0.9.1