chore(protractor): enable testing ng-app-included examples

/cc @petebacondarwin / @juliemr please review :>

Blocks angular#8673

Author: caitp

docs/config/processors/protractor-generate.js

@@ -33,7 +33,8 @@ module.exports = {
         innerTest: file.fileContents,
         pathPrefix: '.', // Hold for if we test with full jQuery
         exampleId: example.id,
-        description: example.doc.id
+        description: example.doc.id,
+        'ng-app-included': example['ng-app-included']
       };
 
       if (env === 'jquery') {

docs/config/templates/protractorTests.template.js

@@ -1,7 +1,10 @@
 describe("{$ doc.description $}", function() {
+  var rootEl;
   beforeEach(function() {
+    rootEl = browser.rootEl;{% if doc['ng-app-included'] %}
+    browser.rootEl = '[ng-app]';{% endif %}
     browser.get("{$ doc.pathPrefix $}/{$ doc.examplePath $}");
   });
-
+  {% if doc['ng-app-included'] %}afterEach(function() { browser.rootEl = rootEl; });{% endif %}
 {$ doc.innerTest $}
 });