Enabled javascript callback.

Author: Ronald Klip

src/ios/MapKit.m

@@ -44,6 +44,10 @@ - (void)createViewWithOptions:(NSDictionary *)options {
     if(atBottom) {
         y += self.webView.bounds.size.height - height;
     }
+	
+	if ([options objectForKey:@"buttonCallback"]) {
+		self.buttonCallback=[[options objectForKey:@"buttonCallback"] description];
+	}
 
     self.childView = [[UIView alloc] initWithFrame:CGRectMake(x,y,width,height)];
     self.mapView = [[MKMapView alloc] initWithFrame:CGRectMake(self.childView.bounds.origin.x, self.childView.bounds.origin.x, self.childView.bounds.size.width, self.childView.bounds.size.height)];