Add hotkey Shift+CMD+Q in editor for quit to project manager, resolves

issue #406

tools/editor/editor_node.cpp

@@ -3463,7 +3463,7 @@ EditorNode::EditorNode() {
 	p->add_separator();
 	p->add_item("Project Settings",RUN_SETTINGS);
 	p->add_separator();
-	p->add_item("Quit to Project List",RUN_PROJECT_MANAGER);
+	p->add_item("Quit to Project List",RUN_PROJECT_MANAGER,KEY_MASK_SHIFT+KEY_MASK_CMD+KEY_Q);
 	p->add_item("Quit",FILE_QUIT,KEY_MASK_CMD+KEY_Q);
 
 	recent_scenes = memnew( PopupMenu );