…ml-ppx, js_of_ocaml-lwt, js_of_ocaml-toplevel, js_of_ocaml-tyxml, js_of_ocaml and js_of_ocaml-ppx_deriving_json (3.7.0)

CHANGES:

## Features/Changes
* Runtime: allow one to override xmlHttpRequest.create (ocsigen/js_of_ocaml#1002)
* Runtime: Change the semantic of MlBytes.toString, introduce MlBytes.toUtf16
* Compiler: initial support for OCaml 4.11
* Compiler: initial support for OCaml 4.12
* Compiler: improve the javascript parser by relying on menhir
  incremental api.
* Compiler: Eliminate allocation of dummy function ocsigen/js_of_ocaml#1013

## Bug fixes
* Compiler: fix code generation for recursive function under for-loops (ocsigen/js_of_ocaml#1009)
* Compiler: the jsoo compiler compiled to javascript was not behaving correctly
            when parsing constant in the from the bytecode
* Compiler: make sure inline doesn't loop indefinitly (ocsigen/js_of_ocaml#1043)
* Compiler: fix bug generating invalid javascript for if-then construct (ocsigen/js_of_ocaml#1046)
* Compiler: do not use polymorphic comparison when joining float values (ocsigen/js_of_ocaml#1048)
* Lib: Rename msg to message in Worker (ocsigen/js_of_ocaml#1037)
* Lib: fix graphics_js when build with separate compilation (ocsigen/js_of_ocaml#1029)