[WIP] Fix multiaddr protocol usage

[shawwn]

Hi, regarding #1

These are the changes that seemed to work for me.

Note that this line is commented out:

			//ma.ProtocolsByName[onionProto.Name] = onionProto

When I uncomment it, I get a build error. I'm not sure why. (But on the other hand, the POC seems to work without it...)

[cretz]

Yeah, unfortunately multiformats/go-multiaddr#73 changed the struct format and no longer allows the name map to be changed. They changed it from ProtocolsByName to protocolsByName which means it cannot be accessed outside the package. If I were doing this again, I'd go over the protocol list until I found the onion one and change each of the struct values instead of creating a new one (of course I'd still leave it for onionListen). Maybe I will soon.

[cretz]

@shawwn - Ok, I basically did what you did here in 1404cd9 but I just changed the protocol object in place instead of skipping the name part.

[shawwn]

Cool :) Thanks!