Switch to java-gradle-plugin, maven-publish and Gradle 6

Add support for lightweight tags.

Adds support for <dirty>

Fixed abbreviation hash length issue.

Relase 2.3.0, with git describe arg pass-through

Task.leftShift(Closure) method has been deprecated in Gradle 3.0 and …

…is scheduled to be removed in Gradle 5.0

Merge pull request #2 from zombiedev/project-dir

use project dir in getGitVersion

Now requires Java 7 (instead of 8)

Official open source release.

First release for gradle plugin portal.