Use ng-if instead of ng-class for easier DOM rendering

Author: Maarten Somers

src/templates/endpoint.html

@@ -19,6 +19,6 @@ <h4>
         </li>
     </ul>
 </div>
-<ul class="list-unstyled collapse operations" ng-class="{in:api.open}">
+<ul class="list-unstyled collapse operations in" ng-if="api.open">
     <li ng-repeat="op in api.operations track by $index" class="operation {{op.httpMethod}}" ng-include="'templates/operation.html'"></li>
 </ul>

src/templates/operation.html

@@ -7,7 +7,7 @@
         </div>
     </a>
 </div>
-<div class="content collapse" ng-class="{in:op.open}">
+<div class="content collapse in" ng-if="op.open">
     <div class="h5" ng-if="op.deprecated" swagger-translate="operationDeprected"></div>
 	<div ng-if="op.description">
 		<h5 swagger-translate="operationImplementationNotes"></h5>