Add web front-end and fix API issues

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

@@ -0,0 +1,6 @@
+import { scanInternals } from './scanInternals';
+import { operate } from '../util/lift';
+export function reduce(accumulator, seed) {
+    return operate(scanInternals(accumulator, seed, arguments.length >= 2, false, true));
+}
+//# sourceMappingURL=reduce.js.map