slivkamiro

I would like to work on this, would it be enough just to add ```scala flyway.envVars() ``` before we load the flyway instance? somewhere [here](https://github.com/flyway/flyway-play/blob/master/plugin/src/main/scala/org/flywaydb/play/Flyways.scala#L77) I found also ```scala flyway.loadDefaultConfigurationFiles()...

Hi @tototoshi, am I on the right track with this one?