New hooks

been meaning to look at this and i keep forgetting. Bumping this up in my issue queue

So an example of hook_activity_access_records_alter().

/**
  * Implementation of hook_activity_access_records_alter().
  */
  function example_activity_access_records_alter(&$grants, $context) {
    foreach ($grants as $module => $value) {
       if ($module != 'og') {
           unset($grants[$module]);
       }
    }    
  }

This example removes any access records except og. Prevents friend modules from providing access.