travis: Pin GitHub until released
Travis: Add another pin for cowabloga port
travis: correct pin
Fix another inconsistency in the Lwt callback API by reordering arguments

We normally specify Req/Res and then body, so reorder the callback
parameters to reflect this.  Since the body type is also explicit,
we remove the sole labelled argument now.
cohttp: some more pins to test the release
release 0.10.0
Merge branch 'master' of github.com:avsm/ocaml-cohttp