feat: (BREAKING CHANGE) overhaul libp2p config and constructor

* docs: update chat example and add info to its readme
* docs: update echo example
* docs: update libp2p in browser example
* docs: update pubsub example
* docs: update peer and content routing examples
* docs: update discovery mechanisms example
* docs: update encrypted comms example
* docs: update protocol and stream muxing example
* feat: add config validation
* test: update CI configs, use only node 8

test/multiaddr-trim.node.js

@@ -0,0 +1,39 @@
+/* eslint-env mocha */
+'use strict'
+
+const chai = require('chai')
+chai.use(require('dirty-chai'))
+const expect = chai.expect
+const series = require('async/series')
+
+const createNode = require('./utils/create-node')
+
+describe('multiaddr trim', () => {
+  it('non used multiaddrs get trimmed', (done) => {
+    let node
+
+    series([
+      (cb) => createNode([
+        '/ip4/0.0.0.0/tcp/999/wss/p2p-webrtc-direct',
+        '/ip4/127.0.0.1/tcp/55555/ws',
+        '/ip4/0.0.0.0/tcp/0/'
+      ], (err, _node) => {
+        expect(err).to.not.exist()
+        node = _node
+        const multiaddrs = node.peerInfo.multiaddrs.toArray()
+        expect(multiaddrs).to.have.length(3)
+        cb()
+      }),
+      (cb) => node.start(cb)
+    ], (err) => {
+      expect(err).to.not.exist()
+
+      const multiaddrs = node.peerInfo.multiaddrs.toArray()
+
+      expect(multiaddrs.length).to.at.least(2)
+      expect(multiaddrs[0].toString())
+        .to.match(/^\/ip4\/127\.0\.0\.1\/tcp\/[0-9]+\/ws\/ipfs\/\w+$/)
+      node.stop(done)
+    })
+  })
+})