Merge branch 'add-matches-and-closest-element-extensions' into 'master'

Added Element extension with .matches and .closest ## What does this MR do? This adds `.matches` and `.closest` polyfills that will help when removing/not using jQuery. I added these in another MR which was then refactored to not require these methods, but I thought we might as well not lose the code. ## Are there points in the code the reviewer needs to double check? ## Why was this MR needed? Help when removing/not using jQuery. ## Screenshots (if relevant) ## Does this MR meet the acceptance criteria? - [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added - [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md) - [ ] API support added - Tests - [ ] Added for this feature/bug - [ ] All builds are passing - [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html) - [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides) - [ ] Branch has no merge conflicts with `master` (if it does - rebase it please) - [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits) ## What are the relevant issue numbers? See merge request !6946

Merge branch 'add-matches-and-closest-element-extensions' into 'master'
1dfe10d3 · Fatih Acet · 6f78b264 · 7c84037e · 1dfe10d3
Commit 1dfe10d3 authored Nov 04, 2016 by Fatih Acet
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element.js.es6 app/assets/javascripts/extensions/element.js.es6 +4 -2

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--- a/app/assets/javascripts/extensions/element.js.es6
+++ b/app/assets/javascripts/extensions/element.js.es6
-/* eslint-disable */
-Element.prototype.matches = Element.prototype.matches || Element.prototype.msMatches;
+/* global Element */
+/* eslint-disable consistent-return, max-len */
+
+Element.prototype.matches = Element.prototype.matches || Element.prototype.msMatchesSelector;

 Element.prototype.closest = function closest(selector, selectedElement = this) {
  if (!selectedElement) return;