Make built binary available for easy install

[petemounce]

It would be great if travis could create a github release (or similar) so that the JAR can easily be downloaded. At the moment, I would need to compile, myself, I think? I'd like to be able to grab the plugin via curl so that I can automate standing up my sonarqube webserver.

Or have I missed it somewhere obvious? How does the update center itself grab the binary?