Merge pull request #45 from avsm/master

Add tcpip.2.0.1
Add new vhd-tool and xen-api-client for cohttp.0.12.0

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Merge pull request #46 from djs55/cohttp-dependents

Add new vhd-tool and xen-api-client for cohttp.0.12.0
+conduit.0.6.1
update cohttp.0.12.0
fix conduit version field
release mirage-http.2.0.0
delete packages that have been merged into upstream opam

see ocaml/opam-repository#3028