Fix typo 'ambuses'

Author: jgable

src/scripts/ambush.coffee

@@ -35,7 +35,7 @@ module.exports = (robot) ->
       msg.send "#{msg.match[1]}? Never heard of 'em"
 
   robot.hear /./i, (msg) ->
-    return unless robot.brain.data.ambuses?
+    return unless robot.brain.data.ambushes?
     if (ambushes = robot.brain.data.ambushes[msg.message.user.name])
       msg.send "Hey, " + msg.message.user.name + ", while you were out:"
       for ambush in ambushes