NOJIRA:  Add missing license header
NOJIRA:  Change the default logfile name to the more cononical 'NotificationPortlet.log'
NOJIRA:  Refactor service impls to send error messages to the UI instead of throwing exceptions in more cases
NOJIRA:  Update the license header in log4j.props
NOJIRA:  Tidy up NOTICE file
NOJIRA:  Add target/ to the .gitignore
NOJIRA:  More updates to NOTICE files