+libres3 v0.3

one of our deps requires >= 4.00.0, so require it here as well for now
Merge pull request #2383 from whitequark/ppx_deriving

Add ppx_deriving
+mirage-net-xen.1.1.2
Merge pull request #2384 from avsm/mirage-net-xen-1.1.2

+mirage-net-xen.1.1.2
added
Sync latest compiler pull requests
did a new tag
Update URLs for old versions of @mmottl's packages.
Update maintainer on various packages.
frenetic.3.1.0
ox.1.1.0 dependency update
ox.1.1.1
Sync latest compiler pull requests
Merge pull request #2389 from yallop/mmottl-updates

Updates to various @mmottl packages
Merge pull request #2391 from seliopou/ox

ox.1.1.1
Merge pull request #2392 from bactrian/sync-prs-1406242801

Sync OCaml compiler PRs
Merge pull request #2390 from seliopou/master

frenetic.3.1.0
Merge pull request #2381 from edwintorok/libres3.0.3

+libres3 v0.3
added files so that plain vanilla sources can be compiled
adhere to the patches and files dir. policy when using vanila sources