SceneMainLoop -> SceneTree

-=-=-=-=-=-=-=-=-=-=-=-=-=-

*YOUR SOURCE MIGHT NOT WORK*
For mor information on fix:
https://github.com/okamstudio/godot/wiki/devel_scene_tree

Other stuff:
-Shower of bullets demo
-Fixes all around

scene/gui/reference_frame.cpp

@@ -32,9 +32,9 @@ void ReferenceFrame::_notification(int p_what) {
 
 	if (p_what==NOTIFICATION_DRAW) {
 
-		if (!is_inside_scene())
+		if (!is_inside_tree())
 			return;
-		if (get_scene()->is_editor_hint())
+		if (get_tree()->is_editor_hint())
 			draw_style_box(get_stylebox("border"),Rect2(Point2(),get_size())) ;
 	}
 }