feat(challenges): add backend challenge infrastructure (#11058)

* Feat: Initial backend view

* Feat: Refactor frame runner

* Feat: backend challenge submit runs tests

* Feat: Backend challenge request

* Feat: Whitelist hyperdev in csp

* Fix: Use app tests instead of challenge tests

* Feat: Allow hyperdev subdomains

* Fix(csp): allow hypderdev.space subdomains

* feat(challenge): submit backend

* feat: Add timeout to test runner (5 sec)

* chore(seed): Add more to test backend

* fix(csp): s/hyperdev/gomix/g

* fix(app): fix code mirror skeleton filepath

* fix(app): remove Gitter saga import

* fix(app): codemirrorskeleton does not need it's own folder
fix(app): cmk needs to work with Null types

* fix: No longer restart the browser when challenges change

* fix(app): Update jquery for challenges

* fix(seed): Remove to promise jquery call

* fix(lint): Undo merge error
undefined is no allowed

* fix(app): linting errors due to bad merge

* fix(seed): Remove old seed file

gulpfile.js

@@ -422,15 +422,9 @@ var watchDependents = [
   'dev-server'
 ];
 
-gulp.task('reload', function() {
-  notify({ message: 'test changed' });
-  reload();
-});
-
 gulp.task('watch', watchDependents, function() {
   gulp.watch(paths.lessFiles, ['less']);
   gulp.watch(paths.js.concat(paths.vendorChallenges), ['js']);
-  gulp.watch(paths.challenges, ['test-challenges', 'reload']);
   gulp.watch(paths.js, ['js']);
 });