Add more structure to errors about oauth HOT 3 OPEN

@mrjones I'll help with this. Option 1 sounds good and could be extended to option 2 in the future if needed.

I'll try to prepare a patch to get us going, or at least better evaluate the options, but it might be a few days.

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Progress so far: https://github.com/deet/oauth/compare

Still need to populate the extra error info in the rest of the API where appropriate.

With these changes, users would not need to change their existing code. Optionally, they can type assert the errors to check the extra info, like:

if err != nil && err.(*oauth.OAuthError).HttpStatusCode() == 0 {
...
}

from oauth.

Hey! Sorry for not commenting sooner ... it slipped through the cracks. However, this looks great. Thanks for taking the time to work on it!

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