Added missing tests, new configuration with HikariCP and bumped Play version

Added the remaining tests for `play2-java-jpa`:

* /fortunes
* /update
* /plaintext

Also added a new benchmark configuration based on `play2-java-jpa` but using the [HikariCP plugin](https://github.com/edulify/play-hikaricp.edulify.com). This allows the default BoneCP connection pool to be replaced with HikariCP.
Great :)