ajax: Fix #14207. file protocol returns status 0, see #8605.
Fix #14036. Remove user/pass from ajaxLocation. Close gh-1340.
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.