Gradle 4.0 Support

[shammancer]

As detailed in the Gradle 4.0 Release Notes there are a few deprecations

Using the attached demo project you receive the following warning:

Gradle now uses separate output directories for each JVM language, but this build assumes a single directory for all classes from a source set. This behaviour has been deprecated and is scheduled to be removed in Gradle 5.0

[shammancer]

The demo project was created using the Spring Initializr defaults for a java gradle project.

[wilkinsona]

Spring Boot's Gradle plugin is managed in https://github.com/spring-projects/spring-boot. There are already issues for this: spring-projects/spring-boot#9559 and spring-projects/spring-boot#9516.