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/utils/create-node.js

@@ -0,0 +1,34 @@
+/* eslint-env mocha */
+'use strict'
+
+const chai = require('chai')
+chai.use(require('dirty-chai'))
+const PeerInfo = require('peer-info')
+const PeerId = require('peer-id')
+const waterfall = require('async/waterfall')
+const Node = require('./bundle-nodejs')
+
+function createNode (multiaddrs, options, callback) {
+  if (typeof options === 'function') {
+    callback = options
+    options = {}
+  }
+
+  options = options || {}
+
+  if (!Array.isArray(multiaddrs)) {
+    multiaddrs = [multiaddrs]
+  }
+
+  waterfall([
+    (cb) => PeerId.create({ bits: 512 }, cb),
+    (peerId, cb) => PeerInfo.create(peerId, cb),
+    (peerInfo, cb) => {
+      multiaddrs.map((ma) => peerInfo.multiaddrs.add(ma))
+      options.peerInfo = peerInfo
+      cb(null, new Node(options))
+    }
+  ], callback)
+}
+
+module.exports = createNode