Add web front-end and fix API issues

node_modules/rxjs/dist/esm5/internal/observable/empty.js

@@ -0,0 +1,9 @@
+import { Observable } from '../Observable';
+export var EMPTY = new Observable(function (subscriber) { return subscriber.complete(); });
+export function empty(scheduler) {
+    return scheduler ? emptyScheduled(scheduler) : EMPTY;
+}
+function emptyScheduled(scheduler) {
+    return new Observable(function (subscriber) { return scheduler.schedule(function () { return subscriber.complete(); }); });
+}
+//# sourceMappingURL=empty.js.map