This reverts commit 2b5b4ebb.

String.prototype.trim doesn't trim BOM in Safari 5.0 so this won't work without additional feature detects.

http://swarm.jquery.org/result/165379

jQuery.ready already fires "ready" event properly, the undefined reference had no effect.

Fix #12278. Promises on non-default queue wait until a dequeue is attempted on an empty queue. Close gh-893.

Related to the patch in gh-870.

Makes sure "adding" a string to a Callbacks object doesn't cause a stack overflow, just ignore the value like 1.7.x righfully did. Fixes #12233. Unit tests added.

Calling load with null as the data parameter now properly issues a GET request, not a POST request. Unit tests added. Fixes #12234.

Originally removed in 86b775d0 as part of the enhancement that allows $(html, props) to use any $.fn method.

Although $.attrFn is undocumented it appears to be a poorly kept secret. jQuery Mobile 1.1 is using it and it's the topic of several blog/StackOverflow posts. Leave an empty object here as a dumpster for now, but it's coming out for good in 1.9.

Fixes issue in non IE browsers that happen to come down this path