Add version 4.0 of the zmq bindings
Add lwt 2.4.5
new releases for react 1.0.0

- lambda-term 1.6
- obus 1.1.6
- utop 1.12
- zed 1.3
+react 1.0.1
Merge pull request #1921 from dbuenzli/react-1.0.1

+react 1.0.1
Merge pull request #1919 from jpdeplaix/master

Add lwt 2.4.5
Compile libzmq 4.0.4 from sources
Update to latest zmq bindings version 4.0-1
Merge pull request #1888 from andersfugmann/master

Add version 4.0 of the zmq bindings
Merge pull request #1920 from diml/master

new releases for react 1.0.0
Fix lambda-term.1.6 checksum
Merge pull request #1924 from samoht/master

Fix lambda-term.1.6 checksum
Add cohttp.0.11.2
Merge pull request #1925 from samoht/master

Add cohttp.0.11.2
add ocaml-bt 0.1.2
Merge pull request #1915 from nojb/master

add ocaml-bt 0.1.2
bt.0.1.2: add cohttp version constraint
Add xe.0.6.0 (XenServer CLI)

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #1927 from nojb/master

bt.0.1.2: add cohttp version constraint
xe depends on uuim (thanks to @samoht for pointing this out)

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