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so reader can see all the supported configuration for the
host constructor

fixes #333

Also, make the libp2p constructor fully useful. There should now be no need to
manually construct a swarm/host.

For some reason, this was causing gx to freak out.

(otherwise, the gx imports won't work)

We already have this one imported into GX. Saves the effort of importing a
different one.

(need to use the canonical repository location for everything to work)