Added method to hide all markers (hide the overlay) or unhide it.

Could be useful in some cases where at certain level of zoom, we just want to hide them

@@ -85,6 +85,10 @@
 	
 	[mapView getScreenCoordinateBounds];
 	
+	
+	[markerManager hideAllMarkers];
+	[markerManager unhideAllMarkers];
+	
 /*	CLLocationCoordinate2D newLocation;
 	newLocation.latitude = -33.9495;
 	newLocation.longitude = 151.2381;

@@ -32,4 +32,7 @@
 - (CLLocationCoordinate2D) getMarkerCoordinate2D: (RMMarker *) marker;
 - (NSArray *) getMarkersForScreenBounds;
 
+- (void) hideAllMarkers;
+- (void) unhideAllMarkers;
+
 @end

@@ -92,4 +92,14 @@
 	return markers;
 }
 
+- (void) hideAllMarkers 
+{
+	[[contents overlay] setHidden:YES];
+}
+
+- (void) unhideAllMarkers
+{
+	[[contents overlay] setHidden:NO];
+}
+
 @end