Removed MongoDB dependency by adding Flapdoodle embedded MongoDB. That allows us to get rid of the utility module we had in place for the MongoDB samples guarding the tests to only run when a MongoDB instance is running.
Tweaked Travis setup to not require the MongoDB service anymore.
Previously a mvn clean install in the Spring Data examples root failed because the Application class in the multi-store example was missing a main method that is required by the Spring Boot Maven plugin.
This app demonstrates how to mix Spring Data JPA and Spring Data MongoDB together (with Spring Data REST on top) to demonstrate how to split them up properly.
