Roughing out the demo app

node_modules/yallist/iterator.js

@@ -0,0 +1,7 @@
+var Yallist = require('./yallist.js')
+
+Yallist.prototype[Symbol.iterator] = function* () {
+  for (let walker = this.head; walker; walker = walker.next) {
+    yield walker.value
+  }
+}