Bump version of Nori

Adds `:convert_attributes_to` option.

Should be helpful to get #559 merged in.
Get options_spec passing again

The wsse:Nonce assertion here is a little unreliable because we aren't
parsing the xml and asserting that there is an wsse:Nonce tag with a
non-empty body.
Add additional fallback for this test

Apparently this exception is dependent on the platform it's running on.
Introduce convert_attributes_to global option.

This adds in the ability to convert attributes on tags in some way, by
passing either a lambda or block.  It requires the current master
branch of Nori, not 2.3.0.