App: add claims debug log also to zendesk handler
Subject: save O attr in subject hash for zendesk

Save also the "o" (organizationName) attribute in the subject hash to
use for zendesk login.

(So far, generate_zendesk_claim was also passing nil as the "o" field).
Merge pull request #17 from University-of-Auckland/develop-more-fixes

More fixes from Vlad