HTML5 client authentication using redis and the new messages

The client sends a 'validate_auth_token_request' to the server, that waits
a 'validate_auth_token_reply' response from bbb-apps to pass to the client.
Still have to get info from /api/enter, for now the meetingId and userId are
hard-coded in the client (AuthenticationModel).
Add a test server to authenticate the HTML5 client
Add missing log/ dir in the HTML5 client