Add Spring Boot Docker Compose Support

[robertmcnees]

This guide asks the user to install an external dependency, Neo4J. A better solution would be using Spring Boot's Docker Compose Support.

As an example, the MySQL Spring Guide already follows this format.

[robertmcnees]

Improvements can also be made to the tests in the complete folder so that an external Neo4J database is not required for passing tests. Currently our CI excludes tests in the complete folder for this reason.