title: How can Sonar be configured to import new rulesets?
body: <p>With maven-pmd-plugin, I am able to configure it to scan my unit tests for PMD violations:</p>
  
  <p><code>&lt;configuration&gt;</code><br/><code>
    &lt;rulesets&gt;</code><br/><code>
      &lt;ruleset&gt;/rulesets/junit.xml&lt;/ruleset&gt;</code><br/><code>
    &lt;/rulesets&gt;</code></p>
  
  <p>Sonar 2.0.1 doesn't seem to provide any way to add in new rulesets that I can see.  Has anyone figured out how to do this?</p>