Just Listening mode

If you have a chat room if some people that doesn't want to hear ector, you can put it in **just listening mode** so he can learn while people are talking.
This creates a link between a non-read sentence and the "response" of the utterer.
Not a problem, but could make the bot slower (because of the propagation phase in the generateResponse)..
In my opinion, the link is not useful, as soon as the bot really chat at least few times (to make the links between the words).