Versioning

Versioning is done via branches, and each branch releases with a major and minor that match the version of Gradle that they're compatible. It's a little bit of a nightmare to maintain, but it offers a level of compatibility which isn't available elsewhere. The benefit, if isn't obvious, lets consumers just use "${gradle.gradleVersion}.+" to get the latest compatible version of a plugin, while also providing a "release hatch" if changes need to be made across Gradle releases.