Updated package to latest version, 2.7. Changes include:
===== 2.7 (2016-01-25) =====
* Features/Changes
** Syntax: ppx_deriving
** Compiler: Add custom_header ability to jsoo generate file (Edgar Aroutiounian)
** Compiler: Bytecode parsing, improved performance
** Lib: add geolocation API (Stéphane Legrand)
** Lib: add Mutation observers API (Stéphane Legrand)
** Lib: add Jstable module (Drup)
** Lib: add WebWorker API (Grégoire Henry)
** Lib: Allow to customize 'in_channel' with specific 'refiller' (Grégoire Henry)
** Lib: Synchronized tyxml 3.6.0
* BugFixes
** Compiler: Fix compilation of the [match with exception] construct
** Compiler: fix compat with the upcoming ocaml 4.03
** Lib: Tyxml_js, discrepancy between Firefox and Chromium
** Lib: various small fixes
** Runtime: Fix Big_int.square_big_int
** Runtime: graphics, fix draw_image with transparent pixel
** Ppx: fix for merlin
===== 2.6 (2015-07-15) =====
* Features/Changes
** Compiler: Findlib is optionnal
** Compiler: improvement of sourcemap support (ie: inlinned sourcemap)
** Compiler: Support for separate compilation (compile cm{o,a} -> js)
** Compiler: more inlining
** Syntax: new ppx syntax
** Syntax: js object literal (camlp4 + ppx)
** Runtime: support for Dynlink
** Runtime: Support for upcomming release of Bin_prot, Core_kernel, Async_kernel
** Lib: add requestAnimationFrame
** Lib: complete Js.Math
** Lib: complete xmlHttpRequest
* Misc
** Drop support for 3.12
* BugFixes
** Runtime: Fix caml_hash
** Lib: fix tyxml + svg
** Lib: various Api fixes
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