Use classpath instead of require

appinfo/app.php

@@ -32,3 +32,5 @@ OCP\App::addNavigationEntry(array(
 	'icon' => OCP\Util::imagePath('office', 'office.png'), 
 	'name' => 'Office')
 );
+
+OC::$CLASSPATH['OCA\Office\Storage'] = 'office/lib/office.php';

index.php

@@ -21,16 +21,12 @@
  * 
  */
 
-require_once('lib/office.php');
-
-
 OCP\User::checkLoggedIn();
 OCP\JSON::checkAppEnabled('office');
 OCP\App::setActiveNavigationEntry( 'office_index' );
 
 OCP\Util::addStyle( 'office', 'style' );
 
-
 $list=\OCA\Office\Storage::getDocuments();
 $tmpl = new OCP\Template('office', 'documents', 'user');
 $tmpl->assign('list', $list);