Add specification version to jars, and impl-title/version & spec vers… (#533)
Add specification version to jars, and impl-title/version & spec vers… (#533)

* Add specification version to jars, and impl-title/version & spec version to javadoc and sources jars

Signed-off-by: Gary Brown <f9023000f29773649f3850298becb9544b5fd6a9@brownuk.com>

* Refactored to have shared manifest in publish.gradle

Signed-off-by: Gary Brown <f9023000f29773649f3850298becb9544b5fd6a9@brownuk.com>

* New improved approach thanks to @jpkrohling

Signed-off-by: Gary Brown <f9023000f29773649f3850298becb9544b5fd6a9@brownuk.com>

uber/jaeger-client-java,uber/jaeger-client-java