Fixes #9221. Wraps openings of html comments and CDATA blocks found at the beginning of inserted script elements into a javascript block comment so that the new implementation of globalEval will not throw an exception in IE (execScript being less lenient than eval). Unit tests added.

This reverts commit f9cccd05.

Make sure that mouseenter/mouseleave fire on the correct element when doing delegation. Fixes #9069.

Landing pull request 374. .animate() Callbacks should fire in correct order (unit test included). Fixes #9100.

More Details:
 - https://github.com/jquery/jquery/pull/374
 - https://github.com/jquery/jquery/issues/9100

More Details:
 - https://github.com/jquery/jquery/pull/370
 - https://github.com/jquery/jquery/issues/8763

Adds unit/support.js to unit tests. Still have to test for #8763 has to be done in its own file however, since Firefox refuses to notify global errors in the iframe (attachEvent, window.onerror and script.onerror all fail).

Add fallback to prop for the window and document. Switch value to use the property instead of the attribute for back compat.

Fixes #9104. Returning null or undefined in a pipe callback shouldn't end up throwing an exception. Silly, silly, me.

Fixes #9109. When jQuery is loaded in the body, then the fake body element used in support has to be inserted before the document's body for boxModel to be properly detected (got the hint by looking at the code in jQuery mobile). Test page added so that we can keep checking this.

Call extend on prop to avoid changing original properties so that per-property easing is not lost in multiple animations with the same props

- The object passed should not change so it can be used in future animates, updated src and tests accordingly.

More Details:
 - https://github.com/jquery/jquery/pull/372

Reduce the boolean list only to those that have corresponding IDLs that don't require being added to propFix; only set the IDL if it exists

- See http://jsfiddle.net/timmywil/u5NLn/ for how boolean attributes are handled in every browser.

Check empty string instead of specified as specified is inconsistent on the name attribute. Fixes #9148.

- Removed IDL-only boolean attributes as well as officially deprecated attributes that we've not supported before

- Construct regex for all attributes which are boolean attributes by specification.

  + This allows us to do what users expect with enumerated attributes and allows us to no longer complicate the issue.

  + People are just too confused with passing "true" instead of true when they should, so we won't have to worry about that anymore.

- Modularize code for dealing with boolean attributes into a separate hook to keep attr short and fast.