Add TOTP (RFC6238) one-time password support

[John Morrissey]

On Sat, Mar 23, 2013 at 11:39:58PM +0000, David Woodhouse wrote:
> On Mon, 2013-03-18 at 23:53 -0400, John Morrissey wrote:
> > How about this latest version, below?
> 
> I've made a few tweaks and applied it. I haven't even build-tested it
> though.

Just tried it, works fine for me(tm). Thanks for accepting the patch.

john
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