Don't need to register the namespace again, it's already done in the EncryptedType complex type.
It has an EncryptionMethod, KeyInfo and CipherData element directly in the root of the class this module is going to be included into. Also added more specs.
Added more specs to the CipherData element.
The EncryptedType complex type now uses xpath to select the correct element. Added more specs to test this.
Removed the encrypted_key fixture and added more specs to the EncryptedKey element.
Merge pull request #3 from digidentity/parse-with-xpath

Use XPath to parse the elements.