decrypt() expects a string not an xmlenc.EncrypedData
Merge pull request #28 from rectalogic/decrypt_string

decrypt() expects a string not an xmlenc.EncrypedData
Attempt at catching knowledge about SAML errors in the middleware.
PEP-8 compliance
Improve documentation
Added HTTP response class.
Editorial
Merge branch 'master' of github.com:rohe/pysaml2