Server render the main page

Also, add hashes to asset file names and use the "entry manifest" plugin
in dev to get auto-reloading.

public/systemjs@2.0.0/dist/extras/global.js

@@ -0,0 +1,57 @@
+/*
+ * SystemJS global script loading support
+ * Extra for the s.js build only
+ * (Included by default in system.js build)
+ */
+(function (global) {
+
+const systemJSPrototype = System.constructor.prototype;
+
+function getLastGlobalProp () {
+  // alternatively Object.keys(global).pop()
+  // but this may be faster (pending benchmarks)
+  let lastProp;
+  for (let p in global)
+    if (global.hasOwnProperty(p))
+      lastProp = p;
+  return lastProp;
+}
+
+let lastGlobalProp;
+const impt = systemJSPrototype.import;
+systemJSPrototype.import = function (id, parentUrl) {
+  lastGlobalProp = getLastGlobalProp();
+  return impt.call(this, id, parentUrl);
+};
+
+const emptyInstantiation = [[], function () { return {} }];
+
+const getRegister = systemJSPrototype.getRegister;
+systemJSPrototype.getRegister = function () {
+  const lastRegister = getRegister.call(this);
+  if (lastRegister)
+    return lastRegister;
+  
+  // no registration -> attempt a global detection as difference from snapshot
+  // when multiple globals, we take the global value to be the last defined new global object property
+  // for performance, this will not support multi-version / global collisions as previous SystemJS versions did
+  // note in Edge, deleting and re-adding a global does not change its ordering
+  const globalProp = getLastGlobalProp();
+  if (lastGlobalProp === globalProp)
+    return emptyInstantiation;
+  
+  lastGlobalProp = globalProp;
+  let globalExport;
+  try {
+    globalExport = global[globalProp];
+  }
+  catch (e) {
+    return emptyInstantiation;
+  }
+
+  return [[], function (_export) {
+    return { execute: function () { _export('default', globalExport) } };
+  }];
+};
+
+})(typeof self !== 'undefined' ? self : global);