[jQuery] Small optimizations

[jQuery] Small optimizations

> If you found any other "small" issues, feel free to use this thread to
discuss them.
I have a few changes to these methods that I have tested on IE/FF/Opera, but
haven't committed them because I have no way to test on Safari:
.index: short-circuit loop rather than use each()
.text: use textContent/innerText when available
.merge: short-circuit the dup loop
.domManip: overall cleanup
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