Modify release script to create a headless tag for bower and publish to NPM
Update Sizzle: remove the use of version ranges
Use grunt and bower packages as local dependencies. Close gh-1433.
Update sizzle location in release script
Fixes #14535: update Sizzle to 1.10.13
Event: Fix #14544. Remove elem from event handle, close gh-1400.

This also reduces memory leaks if the element is removed without cleaning
events (e.g with native DOM operations).

Not pickable into the 1.x branch because oldIE still needs this.
Ajax: Fix #14424. Use ActiveX in IE9+ on local files, close gh-1434.

We can't feature detect ActiveX in IE11, but we can just call
it and catch whatever error occurs, then try normal XHR.
Ref #14180, let focusin/out work on non-element targets.
Release script: create tag after building CDN files
Keep bower_components in .gitignore.
Updating version to 2.1.0-beta2.
Updating the source version to 2.1.0-pre✓™
Release script: Add .npmignore and keep .gitignore when creating the tag
Release script: Add dist files in multiple commits for a clean final commit with a small diff
Ref #14503: Cherry-pick tests.
(cherry picked from commit 27b22f4ef5f3f291204f0e0f9f414ac503f6c8a8)
(cherry picked from commit 8dc0f2ea84e1861d8d8dfa7699268368c659f8e9)
(cherry picked from commit 936126f10de193e2bb1c8280dbc2361ca5d62e29)
Fixes #14548. Add main property to package.json
Fixes #14549. Execute the factory immediately when CommonJS is used in the browser.
Change window to global in the most outer IIFE parameters.

In the most outer IIFE it’s not yet known if the global is window or not.
Using the window variable to denote the global was misleading in that case,
especially that the code didn’t make such assumption, requiring to provide
a Web-like window separately. Renaming window to global clears the confusion.
Effects: Integrate sinon fake timers into tests. Close gh-1377.
Add unit tests for .html( number ). Close gh-1447.