Issue #2548195 by nod_, JohnAlbin, madhavvyas, sriharsha.uppuluri: Only use single quotes in JavaScript and update .eslintrc

Issue #2571755 by nod_, yched, mbaynton, drubb, swentel: Required text field with a Text Editor + AJAX form rebuild = unsubmittable form

Issue #2502617 by droplet, darol100: When changing from a text format with an editor to one without, any user-entered changes are ignored: the original text is saved

Issue #2362637 by yched, slashrsm, rpayanm: Editor.js attach/detach doesn't pass context all the way down

Issue #2317821 by Wim Leers, nod_ | wwalc: Do not show a dialog about changing formats when there is no content.

Issue #2099741 by Wim Leers, wwalc, mr.baileys, eaton, dstol, nod_, effulgentsia: Protect WYSIWYG Editors from XSS Without Destroying User Data.

Issue #1913510 by erich_s, jibran, scresante, nod_, mitron: Core Javascript Files Not Using Standard Indentation.

Issue #2166399 by Wim Leers, nod_, clemens.tolboom: Changing CKEditor configurations by changing text formats causes markup to be lost: warn the user when performing this advanced action.

Issue #1342198 by nod_, droplet, cosmicdreams, RobLoach, aspilicious: Use .on and .off instead of .bind, .unbind and .delegate.

Issue #2031529 by Wim Leers, oadaeh: Fixed JavaScript error when submitting a form that has a text_format() selector set to a text format without associated text editor.

Issue #1890502 by Wim Leers, quicksketch, jessebeach, nod_, sun, effulgentsia: Added CKEditor module to core.

Issue #1833716 by quicksketch, Wim Leers, sun, TwoD: Added WYSIWYG: Introduce 'Text editors' as part of filter format configuration.

Revert "Issue #1833716 by quicksketch, Wim Leers, effulgentsia: added WYSIWYG: Introduce 'Text editors' as part of filter format configuration."

Fixing commit credit.

This reverts commit ee1b6de6.

Issue #1833716 by quicksketch, Wim Leers, effulgentsia: added WYSIWYG: Introduce 'Text editors' as part of filter format configuration.