[CONFIGURATION-537] Removed deprecated ConfigurationFactory class.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1460453 13f79535-47bb-0310-9956-ffa450edef68
XMLPropertiesConfiguration no longer extends PropertiesConfiguration.

This inheritence relation did not make much sense. Most features provided
by PropertiesConfiguration (e.g. the layout, include files, IOFactory) did
not work with XMLPropertiesConfiguration.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1460454 13f79535-47bb-0310-9956-ffa450edef68
Reworked TestVFSFileChangedReloadingStrategy to use XMLConfiguration rather than PropertiesConfiguration.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1460456 13f79535-47bb-0310-9956-ffa450edef68