ocamlfind 1.5.2
Fix ocamlfind remove and upgrade.
Merge pull request #2428 from whitequark/ocamlfind.1.5.2

ocamlfind 1.5.2
+cstruct.1.4.0

Comprehensive addition of bounds checking to all cstruct operations (from @pqwy in #33).  The major API-facing changes are:
* Disallow negative indexing with all cstruct accessors.
* Disallow negative `sub` and `shift` operations.
* Make sure `of_bigarray` cannot create invalid `cstruct` values.

This may break some older `cstruct` consumers that assumed that negative shifts were allowed, and so the version has been bumped to 1.4.0.
+uri.1.7.2
Merge pull request #2441 from dsheets/master

+cow.0.10.1
Merge pull request #2443 from dsheets/uri-1.7.2

+uri.1.7.2
Merge pull request #2442 from avsm/cstruct.1.4.0

+cstruct.1.4.0
Add ibx-0.7.4
Sync latest compiler pull requests
Merge pull request #2445 from bactrian/sync-prs-1407711601

Sync OCaml compiler PRs
Updated postgresql-ocaml
Merge pull request #2446 from mmottl/master

Updated postgresql-ocaml
Tighten core version constraints
Add ppx_import.0.1
Merge pull request #2444 from olgu/ibx

Add ibx-0.7.4
Merge pull request #2447 from whitequark/ppx_import

Add ppx_import.0.1