CORE-4554: added a little clarification to help illustrate the difference between "dismissing" a system notification and marking it as seen
IN PROGRESS - issue CORE-4518: System Message - Status success is
returned even when the date is wrong and message is not generated 
https://pods.iplantcollaborative.org/jira/browse/CORE-4518

When the deactivation date is in the past or when the activation date is
after the deactivation date, the NotificationAgent's PUT /admin/system
endpoint will respond with a failure.
CORE-4465: modified the /messages endpoint to treat a filter of "new" as a request for unseen messages
CORE-4465: bumped the kameleon version number
CORE-4465: fixed a problem with the way that the filter parameter was being extracted