Hypercore.createProtocolStream(protomux) returns NoiseSteam, not the raw stream

[gmaclennan]

Hypercore.createProtocolStream() has slightly different behaviour when you pass it a Protomux instance instead of a raw duplex stream or a noise stream: in the latter cases it returns the raw outer stream (e.g. the noiseStream.rawStream), but when you pass a protomux instance it returns the noise stream. Not something that comes up much, but it's confusing.

[mafintosh]

It should always return the rawstream, will fix