A possible fix for exception in ClaimsResponse.Culture, if Language + Country doesn't make a valid culture.
https://github.com/DotNetOpenAuth/DotNetOpenAuth/issues/260

Just a simple try-catch. According to this comment at SO http://stackoverflow.com/a/12375100 using try-catch is the fastest is you don't expect a continuous stream of illegal combinations.
StyleCop and comment touch-ups.
Fixes exception thrown from unusual language-culture combinations in OpenID Sreg responses.  Closes #261.