added biscuits to grammar and rm nothing

ps-grammar/emergencySituation/object.jsgf

@@ -3,9 +3,9 @@ grammar emergencySituation_object;
 
 public <emergencySituation> = <objectPhrase>;
 
-<objectPhrase> = <water> | <firstaidkit> | <cellphone> | <nothing>;
+<objectPhrase> = <water> | <biscuits> | <cellphone>;
 
 <water> = water;
-<firstaidkit> = first aid kit;
+<biscuits> = biscuits;
 <cellphone> = cell phone;
 <nothing> = nothing;