fix the issue that, unlike keyClass and persistentClass dataStoreClass was not loaded with the use of ClassLoading utils but with Class.forName
GORA-293 (2) one more case need to use of ClassLoadingUtils in DataStoreFactory
Merge branch 'trunk' of https://github.com/apache/gora into trunk

# By Lewis John McGibbney
# Via Lewis John McGibbney
* 'trunk' of https://github.com/apache/gora:
  GORA-171 Implement Daily Rolling File Appender for localised Gora logging