add terminal 'demo'

psGrammar/demos/commands.jsgf

@@ -15,4 +15,4 @@ public <command> = [tobi] ( <followMe> | <ordering> | <learn> | <rec> | <count>
 <save> = (save location);
 <who> = (who are you);
 <gripper> = (show me your gripper);
-<demo> = (end the demonstration);
+<demo> = (end the (demonstration | demo);