If Poster restarted quickly, images may not display in browser

[petersem]

When Posterr is restarted, it clears image and mp3 caches. If it is restarted within 5 seconds, then the connection check in the browser may not see it, and keep trying to display posters and play mp3's that are no longer there.

Need to have some signal in connection check to restart browser if server has restarted, but connection check has not identified the restart.

[petersem]

When the connection check runs, it gets a cold start value from Posterr. if this is less than 6 seconds from the current time, then it is determined that the server restarted rapidly and wasn't detected by the normal connection check. A browser refresh is then performed.