Added a group and description to the javadoc and sources jar tasks

[aaronklor]

Added tests for those additions
Updated the readme to reflect the inclusion of these two tasks (rather than hiding their existence)

[bmuschko]

Thanks for your pull request. I am going to look over it in more detail tomorrow. I saw the ignored tests. From my experience calling project.evaluate() does not help you work around your issue. It simply doesn't behave a like a real-world Gradle project. This fact causes a lot trouble trying to test code that wraps logic into afterEvaluate.

[aaronklor]

That is what I was finding in my research too. Is there a way to accomplish the same task without relying on afterEvaluate? I had manually done that step in an older build script, but I'm not sure where in the lifecycle those parts are evaluated, and therefore I'm not sure if my code implicitly relies on afterEvaluate.

I'd be willing to do some refactoring of configureSigning so those tests can work if you feel it would be beneficial, but I don't want to break any conscious decisions about the operation of the plugin that you've made.

Thanks for looking, this project is quite helpful already and I'm glad to contribute!

[bmuschko]

Thanks for your contribution. I merged the pull request.