CURATOR-126: Fix race condition in CuratorFrameworkImpl.close()
CURATOR-126 - Added a unit test to reproduce this case.
Altered test to make it expose problem. Needed to add debugUnhandledErrorListener for this
Closes #23

Altered test to make it expose problem. Needed to add debugUnhandledErrorListener for this
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/curator