v0.12.0

News and noteworthy:

• Upgrade of Apache Calcite to 1.19 (thanks to @amitvc)
• Better handling of ResultSets close on JDBC driver
• Support for iBatis ORM
• Enhancements in failure handling of BookKeeper/ZooKeeper
• Production ready HerdDB Collecttions Framework
• Checkstyle support (thanks to @tisonkun)

Upgrade and compatibility notes:

• 0.11 clients are fully compatible with 0.12 servers
• 0.12 client is fully compatible with 0.11 servers
• in order to upgrade from 0.11 to 0.12 just update the code as usual and point your configuration to the data volume