* #65 Add some MySQL documentation

* #65 Add some MySQL documentation : fixing typo

* #72 Upgrade to Spring Cloud Finchley M9

* #72 Upgrade to Spring Boot 2.0.1

* #72 Remove @Deprecated API usage

* #72 Upgrade to Spring Cloud Finchley RC2, Spring Boot 2.0.2, Sleuth 2.0.0.RC2, Zipkin Server 2.8.4

* #72 Registering the index ViewController is no more required

* For logging, implement the toString() method of the Pet entity

* #72 Upgrade to Spring Boot Admin 2.0.0

* #72 Add @NoArgsConstructor required for Jackson deserialization

* #72 Upgrade to Spring Boot 2.0.3

* #72 Upgrade to Spring Cloud Finchley RELEASE

* Change Zipkin local host URL

* #72 changes requested by the @mszarlinski code review

* Reduce memory consumption of Docker images #76

The fix switches from an outdated Oracle Java 8 Docker image
to the current openjdk:8 image. The Java VM of this image
supports the parameters to make the Java VM Docker aware.
With this option it becomes possible to set the memory
limit to 256MB which reduces the memory consumption by
75% and leaves the application still operational.

* Added a NOTE about the Docker VM resource usage on Mac and Win

This closes #76 and hopefully improves the first time user-experience
of the Docker compose way of running the demo microservices.

* #42 Add LICENSE

* closes #42 Add LICENSE