Revised doc BatchTestRunnner on Gradle (#376).
Add release notes for version 0.6.1 (#376).
Revised testing documents (#376).
Revised target-platform for version 0.6.1 (#376).
Merge remote-tracking branch 'private/issue/376-M5' into 0.6-develop
Merge remote-tracking branch 'private/0.6-develop' into 0.6-hadoop2-develop