Add web front-end and fix API issues

node_modules/rxjs/dist/esm5/internal/operators/timestamp.js

@@ -0,0 +1,7 @@
+import { dateTimestampProvider } from '../scheduler/dateTimestampProvider';
+import { map } from './map';
+export function timestamp(timestampProvider) {
+    if (timestampProvider === void 0) { timestampProvider = dateTimestampProvider; }
+    return map(function (value) { return ({ value: value, timestamp: timestampProvider.now() }); });
+}
+//# sourceMappingURL=timestamp.js.map