dgeni(api-surface): exclude private symbols for rc6

Author: naomiblack

tools/api-builder/angular.io-package/index.js

@@ -54,6 +54,8 @@ module.exports = new Package('angular.io', [basePackage, targetPackage, cheatshe
     '___platform_browser_private_types__',
     '___platform_browser_dynamic_private__',
     '___platform_browser_dynamic_private_types__',
+    '___platform_server_private__',
+    '___router_private__' ,
     '___core_private_testing_types__',
     '___compiler_private__',
     '__core_private__',