core 111.28.01
Merge pull request #3020 from janestreet/core-111.28.01

core 111.28.01
add license header to mirleft opams
Split Travis build and install stages.
sociaml-oauth-client description: Ocaml ~> OCaml
Merge pull request #3029 from hannesm/add-mirleft-license

add license header to mirleft opams
restrict facebook-sdk.0.2.12 to ocaml < 4.02.
Merge branch 'mirage2-constraints' of github.com:mirage/opam-repository into mirage2-constraints
improve facebook-sdk.0.2.12 constraint: requires a specific version of atd
Constrain lwt 2.4.3 to OCaml < 4.02.0
Merge pull request #3031 from yallop/travis-split-install

Split build and install stages in .travis.yml
Merge branch 'master' of github.com:OCamlPro/opam-repository into mirage2-constraints

Conflicts:
	packages/lwt/lwt.2.4.3/opam
Merge branch 'mirage2-constraints' into mirage2-release