Add note about using 303 See Other for XHR requests other than GET/POST

IE since version 6 and recently Chrome and Firefox have started following
302 redirects from XHR requests other than GET/POST using the original request
method. This can lead to DELETE requests being redirected amongst other things.

Although it doesn't directly affect the Rails framework since it doesn't return
a 302 redirect to any non-GET/POST request a note has been added to raise
awareness of the issue. Some references:

Original article from @technoweenie:
http://techno-weenie.net/2011/8/19/ie9-deletes-stuff/

Hacker News discussion of the article:
http://news.ycombinator.com/item?id=2903493

WebKit bug report:
https://bugs.webkit.org/show_bug.cgi?id=46183

Firefox bug report and changeset:
https://bugzilla.mozilla.org/show_bug.cgi?id=598304
https://hg.mozilla.org/mozilla-central/rev/9525d7e2d20d

Chrome bug report:
http://code.google.com/p/chromium/issues/detail?id=56373

HTTPbis bug report and changeset:
http://trac.tools.ietf.org/wg/httpbis/trac/ticket/160
http://trac.tools.ietf.org/wg/httpbis/trac/changeset/1428

Roy T. Fielding's history of the issue:
http://ftp.ics.uci.edu/pub/ietf/http/hypermail/1997q3/0611.html

Automated browser tests for the issue:
http://www.mnot.net/javascript/xmlhttprequest/

Fixes #4144

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