Improve Proposal#session_notes_url to ensure SETTINGS.public_url is set.
Improve Proposal#session_notes_url to ensure SETTINGS.public_url is set.

mynameisfashanu/openconferenceware,osbridge/openconferenceware,mynameisfashanu/openconferenceware,osbridge/openconferenceware,mynameisfashanu/openconferenceware,osbridge/openconferenceware,mynameisfashanu/openconferenceware,osbridge/openconferenceware,ondrocks/openconferenceware,ondrocks/openconferenceware,ondrocks/openconferenceware,ondrocks/openconferenceware