Fix ClassLoader interaction with Spring Boot Devtools

[aileftech]

If devtools are included in the project, they inject a custom ClassLoader that interferes with the correct initialization of the EntityManager (see #1).

The current solution is not to include Spring Boot Devtools in order to run the project. Check what would be needed to fix this issue and restore compatibility with devtools.

[odrotbohm]

I think the only thing you need to do to fix this is telling Devtools, that it should include your JAR with the class loader that loads application classes by adding a META-INF/spring-devtools.properties. A project that needed to do something similar can be found here.

[aileftech]

Thanks! I've just tested this and it works perfectly. I'll include it in the next release.