Make non-expandable flash successes timeout.

Per [69962574](https://www.pivotaltracker.com/story/show/69962574) after rejection due to missing "disappear after five seconds" case.  Note that audit folder success messages must remain, so this accomplishes by giving a special class to the expandable flash messages that the previous version created (feature/verbose-flash-message3).  Detects flash messages for the timeout call by binding the parent element.