herelib: add missing ocaml-version>=4.00 constraint
Merge pull request #1733 from mirage/master

+github.0.7.1
Eliom 2 & 3 depend on Ocsigenserver < 2.3
Merge branch 'master' of https://github.com/ocaml/opam-repository
Eliom 3.0.0 depends on Server < 2.3
Added facebook-sdk-for-ocaml.0.2.0, an SDK for the Facebook Graph API
Updated facebook-sdk-for-ocaml to version 0.2.0
Bumped facebook-sdk-for-ocaml to version 0.2.2 to deal with uninstall errors in previous versions
Updated facebook-sdk-for-ocaml to version 0.2.5
Upgraded facebook-sdk-for-ocaml to version 0.2.6
Merge pull request #1731 from balat/master

Ocsigen Tyxml 3.0.0 and Ocsigen Server 2.3.0
+cohttp.0.10.0
+websocket.0.7.0
update constraints for new cohttp
+cowabloga.0.0.5
+irminsule.0.5.1
+github.0.8.0
Add missing constraints for vhd-tool
websocket.0.6: requires ocaml4+
websocket.0.7: requires ocaml4+