Add trust mechanism on connection

[piranna]

After a connection has been achieved (ideally after doing the secure connection on issue #12 ), send an unique ID generated the first time the application was launched (or set by the user) stored on the localStorage that efectively identify uniquely to the peer over diferent sessions, and use a digest mechanism to authenticate it, so if we trust on it we had their digest token stored on local and authentication is successful. If not, authentication is failed and we can not be sure that he is what he said he is and we can act in consecuence.