Added new scene files to the configuration file (These new files are commented by default).

openspace.cfg

@@ -8,6 +8,10 @@ return {
     -- Sets the scene that is to be loaded by OpenSpace. A scene file is a description
     -- of all entities that will be visible during an instance of OpenSpace
     Scene = "${SCENE}/default_nh.scene",
+    -- Scene = "${SCENE}/default.scene",
+    -- Scene = "${SCENE}/default-modified.scene",
+    -- Scene = "${SCENE}/rosetta.scene",
+    -- Scene = "${SCENE}/dawn.scene",
 
     Paths = {
         SGCT = "${BASE_PATH}/config/sgct",