fixed memory leak: release data objects in RMMarker

@@ -28,6 +28,7 @@ extern NSString * const RMMarkerRedKey;
 - (id) initWithUIImage: (UIImage*) image;
 - (id) initWithStyle: (RMMarkerStyle*) style;
 - (id) initWithNamedStyle: (NSString*) styleName;
+- (void) dealloc;
 
 @property (assign, nonatomic) RMXYPoint location;
 @property (retain) NSObject* data;

@@ -73,6 +73,12 @@ static CGImageRef _markerBlue = nil;
 	return [self initWithStyle: style];
 }
 
+- (void) dealloc 
+{
+	[data release];
+	[super dealloc];
+}
+
 - (void)zoomByFactor: (float) zoomFactor near:(CGPoint) center
 {
 	self.position = RMScaleCGPointAboutPoint(self.position, zoomFactor, center);