Ajax: remove event dependency from the ajax module

Ref 4e7f34f6296111f7f91d621397dfb02c6bf4c41f
Misc: Need for speed removed by 9ad6e7e
(cherry picked from commit ff928f5775566ee54f26fcb0f9a326719c32e63c)
Misc: Update all references to bugs.jquery.com

(cherry-picked from 3e89a53265bfdc992d7a97a01c5d1025e48e5906)

Fixes gh-1681
Closes gh-1716
Build: Upgrade to commitplease 2.0.0

commitplease now accepts "[tmp]:" and similar to temporary commits,
useful while updating pull requests that are squashed later.

(cherry picked from commit 5bc1ddc5cc96e509e0fadb0c1e3a70927de6ed1c)
Deprecated: Drop size and andSelf methods

(cherry-picked from f110360f65a268e959ae892ca36e85da3d91e606)

Fixes gh-1749
Closes gh-1822
Test: Switch leftover andSelf to addBack
Change broken url to wayback one
README: Update the description of the deprecated module

(cherry-picked from 1d752731011d35e985271334ff98186728949f03)

.andSelf is now gone.
Ajax: Fix for request aborted in ajaxSend

Fixes gh-1775
Close gh-1619
CSS: Fix get upper case alpha opacity in IE8
CSS: Use feature detection and conform style to syntax in test