added encrypted assertion files
When a key name is specified, select the certificate it belongs to.
added encryptedassertion to response
Use a proc to determine the current time in the factories
Merge pull request #23 from JanDintel/fix-factories

Use a proc to determine the current time in the factories
Added the key_name method to the Signature class.
Moved the key descriptor lookup into the SSO Descriptor Type complex type.
fixed plural encrypted_assertion which caused endless loop
An EncryptedAttribute should only have EncryptedKeys retrieved from the root and not contain EncryptedKey elements obtained through the EncryptedData element.
Merge pull request #21 from digidentity/filter-certificate-by-keyname

When a key name is specified, select the certificate it belongs to.
Merge pull request #24 from digidentity/encrypted-attribute-update

An EncryptedAttribute should only have EncryptedKeys retrieved from the root and not contain EncryptedKey elements obtained through the EncryptedData element.
added a current provider option
added null provider
added controller helper
added xmlenc dependency
refactored saml config
updated readme
added encrypt_assertion util method
added tests for encrypted assertions and Saml::Util.encrypt_assertion
bumped version