Add xenstore_transport.0.9.4

Signed-off-by: David Scott <dave.scott@citrix.com>
+uucd.2.0.0
+uunf.0.9.3
Make camlp4 a hard dependency on sexplib for now.

A large number of packages will need to have an explicit type_conv
dependency before this will work.
Merge pull request #2241 from djs55/xenstore_transport.0.9.4

Add xenstore_transport.0.9.4
Merge pull request #2242 from dbuenzli/uucd-2.0.0

+uucd.2.0.0
Merge pull request #2244 from avsm/restore-sexplib-camlp4

Make camlp4 a hard dependency on sexplib for now.
Merge pull request #2243 from dbuenzli/uunf-0.9.3

+uunf.0.9.3
Add gadelac 0.6.1.
+dns.0.9.0
Merge pull request #2245 from AbdallahS/master

Add gadelac 0.6.1.
Merge pull request #2246 from mirage/master

+dns.0.9.0