Be more verbose in handleCrash(Throwable).

Essentials/src/com/earth2me/essentials/Essentials.java

@@ -667,6 +667,7 @@ public class Essentials extends JavaPlugin implements net.ess3.api.IEssentials {
     private void handleCrash(Throwable exception) {
         final PluginManager pm = getServer().getPluginManager();
         LOGGER.log(Level.SEVERE, exception.toString());
+        exception.printStackTrace();
         pm.registerEvents(new Listener() {
             @EventHandler(priority = EventPriority.LOW)
             public void onPlayerJoin(final PlayerJoinEvent event) {