Adding SAML.generateServiceProviderMetadata() function.  (& test)
Expose generateServiceProviderMetadata through Strategy object.
Jshint fix.
Update README.md
Bump version to 0.2.1.
Merging changes from pull request #35 (mradamlacey:master).
Merge from bergie/passport-saml master
Additional support to check NotBefore and NotOnOrAfter as part of SubjectConfirmation element