Decryption of encrypted SAML responses.

[Heikkips]

Added a functionality for the decryption of the encrypted assertions of the SAML responses.

Can be used from the custom scripts in following way:

saml_response = requestParameters.get("SAMLResponse")[0]

samlResponse = org.gluu.saml.Response(self.samlConfiguration)

samlResponse.loadEncryptedXmlFromBase64(saml_response)

saml_response_attributes = samlResponse.getDecryptedAttributes(
                                                self.keystoreType, 
                                                self.keystoreLocation, self.keystorePassword, 
                                                self.keyAlias,self.keyPassword)

saml_response_name_id = samlResponse.getDecryptedNameId()