checking existing paging store before putting a new one into the map.

This avoids the same paging store being started twice.
fix bug: https://bugzilla.redhat.com/show_bug.cgi?id=900899
closing pages in ReplicationEndpoint.close()
Merge pull request #979 from gaohoward/master

checking existing paging store before putting a new one into the map.
Fix logging.properties used in our JUnit tests.
Add comment to help users figure out examples' dependency list.