feat: always populate MANIFEST with project.name and .version

This pull request directs the plugin to configure the jar task (if present, provided by the java plugin) and/or the war task (if present, provided by the war plugin) to set the Implementation-Version and Implementation-Title attributes in the MANIFEST.MF file included in the result.

The end result is that issue #1 (closed) can be satisfied by pulling out Implementation-Version from the MANIFEST. By using MANIFEST, we use a file in Java specifications and we don't have to pollute the build of downstream projects with our own custom properties file.

Manifest reference:

https://docs.oracle.com/javase/tutorial/deployment/jar/packageman.html

cc: @paul.erickson @apatwary

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Added 1 commit:

• 965b82ff - test: confirm we can still add the plugin to projects w/o java/war

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Same closure, but again the chicken-and-egg problem where we can't apply the plugin generated by this project to the project itself.

Added 1 commit:

• 718f28a5 - feat: add artifact-version.groovy expected by Jenkins build

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Nice!

Added 1 commit:

• 161c85a3 - docs: describe how to get Jenkins to tag releases

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Status changed to merged

mentioned in commit 300638dc

This is going to be awesome.