ReloadingFileBasedConfigurationBuilder now evaluates the reloadingDetectorFactory property in its parameters.

This makes it possible to specify a custom ReloadingDetectoryFactory, so that
different reloading strategies can be used.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1461176 13f79535-47bb-0310-9956-ffa450edef68