Make debug and verbose options

[nikravi]

Sonar runner is set up with -X and outputs too much information. Would be nice to have it as parameter (debug), also turning off all INFO messages, but I tried the -Dsonar.verbose=false from https://github.com/SonarOpenCommunity/sonar-cxx/wiki/Get-debug-information without success. What do you think?

[nikravi]

If it's not possible to silent sonar runner, maybe we can hide the 'stdout' info

process.stdout.on('data', function (c) {
                    gutil.log(c);
                });

[h36yang]

@machellerogden
grunt-sonar-runner has a "debug" option in the parameters to enable/disable debug logging. Do you think you could add the same support to gulp-sonar? E.g. when debug: false, you could hide the stdout logs.