Adding a "noMatch" result

[maxpastor]

1- check my last commit for the context of this 2- the networks ouputs a string of value "noMatch" if it's not confident enough 3- the networks must return a value of 0.9 to be sure that it matches 4- it blocks false positives 5- it might send false negatives but it just means that the networks need more training 6- it's now a more useful module for chatbots maker, but it might not be your goal to make it a tool for them.

So that's your turn now. Nice work BTW, this is the best NLP module that I found !