added save command to restaurant command grammar. This prevents always understanding "follow"

ps-grammar/restaurant/commands.jsgf

 #JSGF V1.0;
 grammar restaurant_save_command;
 
-public <restaurant> = [tobi] [please] (<followMe> | <stop>);
+public <restaurant> = [tobi] [please] (<followMe> | <stop> | <save>);
+<save> = save [([the | a]) location];
 <followMe> = (follow me) | (come [(with me) | here]) | (keep up);
 <stop> = stop [this];