vastly reduce the number of osx tests to reduce the worker backlog
bsdowl: Port bsdowl v2.2
gasoline: Port Gasoline v0.1
gasoline: Add a META file
Update Oolc to v0.3
Partially revert #2922

This is causing a bug in 1.2 (see ocaml/opam#1831 and ocaml/opam#1834) and was working fine anyway.
Merge pull request #2981 from atrieu/master

Update Oolc to v0.3
Merge pull request #2982 from samoht/master

Partially revert #2922
Add p3.0.0.6
fix dependency of mirage-xen on OCaml versions
All recent versions of mirage-xen have a configure script that mandates OCaml version 4.00.1 or 4.01.0
mirage-xen: more constraints on OCaml versions
Merge pull request #2983 from tomjridge/add_p3_006

Add p3.0.0.6
Add version constraints for ocaml-git on latests irmin versions
Merge pull request #2985 from samoht/irmin

Add version constraints for ocaml-git on latests irmin versions
travis: filter out transitive env constraint failure

Also, print more information about the availability test and failure.
Merge pull request #2976 from dsheets/travis-transitive-failure

Travis transitive failure fix
Apply the constraints in mirage-xen.0.9.3 to 0.9.1 and 0.9.2
Merge pull request #2984 from samoht/mirage-xen

Mirage xen
[opam-publish] description for mirage-tc.0.1.0
Remove unstable git2fat

The package is broken and relies on older version of lots of things which are not available anymore. Can resurect it if really needed (but I doubt)