first cut on XRI resolver

 This commit adds openid service resolver that does discovery using XRI (proxy
 only), Yadis protocol and html-based discovery. It uses expat as xml parsing
 engine, which makes it a bit more strict about html it receives, but I think
 failing to discover links in *severely* broken html is better than
 misdetecting links, hidden in comments or such.

 This is highly experimental code and needs more thoughts and testing.

 Thanks everyone pushing me towards this development. Namely Joseph, John,
 Gen.

Signed-off-by: Michael Krelin <hacker@klever.net>

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