use a single argument for add_callback - see #478
Merge pull request #479 from mozilla-services/zmq-13.0.0

use a single argument for add_callback - see #478
various tests fixes and reload enhancements
make sure __CF_USER_TEXT_ENCODING gets discarded in all cases
Merge pull request #480 from mozilla-services/fixes

test fixes on a slow/old Macbook
added a test
Merge branch 'master' into hook-fix