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

tools/editor/groups_editor.cpp

@@ -36,7 +36,7 @@
 
 void GroupsEditor::_notification(int p_what) {
 	
-	if (p_what==NOTIFICATION_ENTER_SCENE) {
+	if (p_what==NOTIFICATION_ENTER_TREE) {
 		connect("confirmed", this,"_close");
 	}	
 }