The MSBuild SonarQube Runner TFS 2015 Build Tasks are now available out of the box on Visual Studio Online, and even on Hosted Build Agents! This means that SonarQube analysis can now be enabled in a few clicks on any Visual Studio Online project without having to install anything!

I could tell you more, but Jean-Marc Prieur from Microsoft has already done such a beautiful job that you should just read what he wrote in his Visual Studio ALM blog post.