Merge pull request #131 from allenxwang/master

Fix issue #125. Add JUnit to clarify issue #128. Add Junit for issue #123 and issue #109.
Gradle Release Plugin - pre tag commit:  'archaius-0.5.12'.
Gradle Release Plugin - new version commit:  'archaius-0.5.13-SNAPSHOT'.
Fix #138 and #116.