Raise events.

Should probably improve this to only raise an event when the
values change, but will do for now.

src/com/dmdirc/FrameContainer.java

 import com.dmdirc.ui.messages.Formatter;
 import com.dmdirc.ui.messages.IRCDocument;
 import com.dmdirc.ui.messages.Styliser;
+import com.dmdirc.ui.messages.UnreadStatusManager;
 import com.dmdirc.ui.messages.sink.MessageSinkManager;
 import com.dmdirc.util.ChildEventBusManager;
 import com.dmdirc.util.URLBuilder;
     private final DMDircMBassador eventBus;
     /** The icon manager to use for this container. */
     private final IconManager iconManager;
+    /** The manager handling this frame's unread status. */
+    private final UnreadStatusManager unreadStatusManager;
     /** Whether or not this container is writable. */
     private final boolean writable;
     /** The back buffer factory. */
         eventBusManager = new ChildEventBusManager(eventBus);
         eventBusManager.connect();
         this.eventBus = eventBusManager.getChildBus();
+        this.unreadStatusManager = new UnreadStatusManager(this);
+        this.eventBus.subscribe(unreadStatusManager);
 
         setIcon(icon);
     }
         eventBusManager = new ChildEventBusManager(eventBus);
         eventBusManager.connect();
         this.eventBus = eventBusManager.getChildBus();
+        this.unreadStatusManager = new UnreadStatusManager(this);
+        this.eventBus.subscribe(unreadStatusManager);
 
         setIcon(icon);
     }

src/com/dmdirc/ui/messages/UnreadStatusManager.java

     private final DMDircMBassador eventBus;
     private final FrameContainer container;
     private int unreadLines;
-    private Optional<Colour> notificationColour;
+    private Optional<Colour> notificationColour = Optional.empty();
 
     private Colour miscellaneousColour = Colour.GREEN;
     private Colour messageColour = Colour.BLACK;