Add block scoping to challenges url

common/app/routes/challenges/redux/next-challenge-saga.js

@@ -0,0 +1,23 @@
+import { Observable } from 'rx';
+import { push } from 'react-router-redux';
+import { moveToNextChallenge } from './types';
+import { getNextChallenge } from '../utils';
+import { updateCurrentChallenge } from './actions';
+// import { createErrorObservable, makeToast } from '../../../redux/actions';
+
+export default function nextChallengeSaga(actions$, getState) {
+  return actions$
+    .filter(({ type }) => type === moveToNextChallenge)
+    .flatMap(() => {
+      const state = getState();
+      const nextChallenge = getNextChallenge(
+        state.challengesApp.challenge,
+        state.entities,
+        state.challengesApp.superBlocks
+      );
+      return Observable.of(
+        updateCurrentChallenge(nextChallenge),
+        push(`/challenges/${nextChallenge.dashedName}`)
+      );
+    });
+}