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There were previously 4 different ways of passing various options
into BasicHost construction.

1. Function parameters to New
2. Option parameters to New
3. Global variables, e.g. NegotiateTimeout
4. Options struct, in the calling code in go-ipfs

This changeset deprecated all of these, and introduces the HostOpts
struct to replace them. It also introduces a new constructor called
NewHost, which accepts a *HostOpts.

The old New constructor continues to work the same way,
but is from now on deprecated too.

basichost: allow overriding Addrs()

gx: update go-libp2p-peerstore

typo

Improve ObservedAddrSet behaviour

Libp2p examples

The example proxies http requests through a libp2p stream.

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

add first tutorial, showing creation of a host

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>

Remove relay protocol (and roadmap.md)

more imports cleanup, another dup.

imports cleanup, remove dup

fix multistream import paths