Add "chosen:close" triggerable event
Docs!
Whitespace!
Merge pull request #1663 from harvesthq/chosen_close_event

"chosen:close" triggerable event
Support jQuery < 1.6 by not using $.fn.is().

Adapted from rooby's pull request for issue #1555.
Merge pull request #1702 from opensourcery/master

Remove use of `$.fn.is()` in favor of more widely supported methods.