Update moment.js to 2.4.0

Changes:
* **Deprecate** globally exported moment, will be removed in next major
* New languages
  * Farose (fo) [#1206](https://github.com/moment/moment/issues/1206)
  * Tagalog/Filipino (tl-ph) [#1197](https://github.com/moment/moment/issues/1197)
  * Welsh (cy) [#1214](https://github.com/moment/moment/issues/1214)
* Bugfixes
  * properly handle Z at the end of iso RegExp [#1187](https://github.com/moment/moment/issues/1187)
  * chinese meridian time improvements [#1076](https://github.com/moment/moment/issues/1076)
  * fix language tests [#1177](https://github.com/moment/moment/issues/1177)
  * remove some failing tests (that should have never existed :))
    [#1185](https://github.com/moment/moment/issues/#1185)
    [#1183](https://github.com/moment/moment/issues/1183)
  * handle russian noun cases in weird cases [#1195](https://github.com/moment/moment/issues/1195]