fix contact details merge in message, add tests
fixes #185, #183 - relax notification rules validation, and log validation errors
update changelog
retain old contact_id in nr's if one is not supplied on update
Merge pull request #181 from ali-graham/179_fix_contact_names_in_notifications

fix contact details merge in message, add tests
apply stylisitic suggestions from @ali-graham
Merge pull request #186 from jessereynolds/185_relax_notification_rules

185 relax notification rules
prepare 0.7.7 release