Better system tray integration, visual tweaks
-added tray icons for waiting, running, and term states

SysTrayListener.java:
-renamed to SysTray
-added methods to set tray icon bases on service status (waiting, running, terminating)
-added basic about dialog to display version number
-tested in windows, mac, linux

index.css:
-changed color of widget notification flash

index.html:
-removed progressbar