Markdown in Python: Support all valid email addresses

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This was recently brought up on the [Markdown discussion list][1], but there are various characters that are allowed in email addresses, that non of the markdown implementations support. Interestingly, Python-Markdown appears to support the most at this time, but there is room for improvement. Perhaps we should add a test case as all the following addresses are valid:

<a+b@c.org>

<abc.123@example.com>

<1234567890@example.com>

<_______@example.com>

<abc+mailbox/department=shipping@example.com>

<!#$%&'*+-/=?^_`.{|}~@example.com> (all of these characters are allowed)

<"abc@def"@example.com> (anything goes inside quotation marks)

<"Fred Bloggs"@example.com>

It appears to me that we only have issues with the last three. Although the second to last one may be right. I'm not sure how we should treat the quotes. The examples come from [Wikipedia][2].

[1]: http://six.pairlist.net/pipermail/markdown-discuss/2008-July/001362.html
[2]: http://en.wikipedia.org/wiki/E-mail_address#RFC_Examples

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