Added back in some of Joern's new .html() docs, and made .text(String) (a lot of users expect this method to be a setter and a getter).

Made significant changes to the expression engine. Is now significantly faster (4-10x). It passes the test suite (but be sure to let me know if there are any regressions).

Implemented a better error handling for ajax requests. Exceptions caused by dropping connections are now handled, too.

Improved docs for blur() and focus(), mentioning the difference between calling the jQuery method and the DOM method

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<tbody> duplicated, bug#418 (jQuery.clean & domManip)
query for id in context ignores context, bug#267

finally added the toggle option for animate(). It's not beautiful right now, but it works for the time.

Renamed $.ajax's "before"-option to "beforeSend" to prevent conflict with form plugin - may be a good convention to use beforeXXX and afterXXX everytime for callbacks...

Simplified XMLHttpRequest shadow (tested on 5.5, 6 and 7); Introduced preprocess callback (#384) - IE seems to fail to send the correct headers