Parameter cannot be used as HashMap key (missing #hashCode, #equals, #toString)

[ghostcity]

I'd like to use the local port forwarding's parameter type as a HashMap's key. Since the type (currently) does not contain the "Java boilerplate" #hashCode #equals, and #toString, it cannot be used as an according key.

The solution is quite simple -- I will offer such methods as a merge request.

[hierynomus]

Merged #653