Provide a executable JAR

[ChristianSchwarz]

Provide a executable JAR instead of letting the users compile it by them self.

[goneall]

@ChristianSchwarz You can download the executable Jar from maven or bintray

[ChristianSchwarz]

Thank you for the link! I was confused by the https://spdx.org/tools pages which redirects to github releases page where the sources can be downloaded.
Maybe it is a good idea to redirect to the readme.md of this project, where a link to maven or bintray can be found. For my understanding jar-repositories like maven are used by build tools to download dependencies so it is not the first place where useres might expect it. An other idea is to publish the jar with the sources on the project release page here in github.

[goneall]

@ChristianSchwarz Good suggestion. We used to manually upload the binaries to the release page. I'll leave this issue open to track changing the release scripts to upload to the release page automatically. In the interim, I'll pull in @jmanbeck to see about updating the links on the website.