Merge pull request #1 from brentschmaltz/dev

OpenId Metadata.
updated assembly info
Newline added to end of file.
make nuspec's consistent
Missed period.
1. Added copy constructor for TokenValidationParameters
2. Fixed broken tests
3. Modified IdentityComparer to reduce code redundancy
4. Saml1 and Saml2 ReadToken marked override rather than virtual
5. AudienceValidator throws SecurityTokenInvalidAudienceException
6. Added shell for IExpirableNonceCache