add ng-cloak to example

Author: David Adam Justice

src/bootstrap-example.html

@@ -30,7 +30,7 @@ <h3>The Generated Form</h3>
       <form name="ngform" sf-model="person" sf-form="form" sf-schema="schema" sf-decorator="{{decorator}}">
       </form>
       <h3>Model</h3>
-      <pre>{{pretty()}}</pre>
+      <pre ng-cloak>{{pretty()}}</pre>
     </div>
     <div class="col-sm-8">
       <h3>Form</h3>