Convert to ES5, add web server

* No compilation step
 * Beginnings of web interface
 * Simple express server; React-based frontend
 * CommonJS style across codebase; auto-converts to RequireJS for browser
 * Using diffsync for realtime UI
 * "Provider" -> "Plugin"
 * Plugins expose one or more Providers

public/js/admin.jsx

@@ -0,0 +1,16 @@
+
+
+module.exports.Admin = React.createClass({
+  render: function() {
+    return (
+      <div className="container">
+        <h2>Installed Plugins</h2>
+        <ul>
+          { this.props.root.plugins.map(function(plugin) {
+            return <li key={plugin.name}>{plugin.name}</li>
+          })}
+        </ul>
+      </div>
+    );
+  }
+});