rewrite of plugin to kotlin and using gradle to build, more in line w…

…ith jetbrains recommendations

Thanks to @achievec PR#77 your help is much appreciated

Bumping to v1.3.1

Version 1.3.0

GitHub Issue #28

Upgrading project to Jetty 9.3
The plugin now depends on Java 8.

Fixing GitHub Issue #19

Alerting the user to compile / make the project prior to the conf creation.

Seventh Release - dcritchl

Sixth Release

Fifth Release - tchudyk

Fourth Release