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

When not using -secio, this command prints a warning. This confuses users so we
should just tell users to use it in the instructions.

fixes #179

The example proxies http requests through a libp2p stream.

License: MIT
Signed-off-by: Hector Sanjuan <hector@protocol.ai>

* Do not use testutil to generate random keys and ids since this is a testing
dependency. Use crypto.GenerateKeyPair() instead.
* Echo full lines
* Improve output by telling the user what to run
* More code comments

License: MIT
Signed-off-by: Hector Sanjuan <hector@protocol.ai>

  * Extended explanations and links to relevant godocs
  * Some renames (the host is not dummy, it's a basic)
  * Use addAddr() and let NewStream open the connection

License: MIT
Signed-off-by: Hector Sanjuan <hector@protocol.ai>