New Feature > Update Doclet in order to make it compatible with Java9 and make it compatible with Gradle build

[ghilainm]

I would like to update the project to make it compatible with Java9+ and the new Doclet API.

In the same time I would like to make it compatible with Gralde build.

In order to follow the the work started in another pull request I have also migrated to springfox-swagger2-3.0.0-SNAPSHOT