add option to handle table names like Rails, add jarmonicaVersion

handle table names like Rails

(related to #113 )

If you configure as follow, refer method generates reference column named like tablename_id .

extensions.extraProperties["tableNamePluralization"] = true

Document: https://github.com/KenjiOhtsuka/harmonica/wiki/Configuration

jarmonicaVersion

Now you can check where the migration processed, namely current migration version.

./gradlew jarmonicaVersion

Output:

Version: 20180714192339748