Provide branch coverage information to Sonar

[orium]

The current version does not seem to give Sonar branch coverage information. This is an important metric that would be nice to have available.

[RadoBuransky]

This plugin does not actually compute any coverage. It uses the https://github.com/scoverage/scalac-scoverage-plugin to do the job and then only uploads the results to Sonar. Scoverage is meant to compute statement coverage by definition. For branch coverage you can try use a tool for Java which uses bytecode as the source.

[orium]

I believe scoverage computes the branch coverage already.