This patch allows for parallel execution of tasks. The configuration would resemble the following:
<tasks>
   <parallel>
        <tasks>
              <serial>
                   <tasks>
                        <exec>...make.release...</exec>
                        <exec>...test.release...</exec>
                   </tasks>
              </serial>
              <serial>
                   <tasks>
                        <exec>...make.debug...</exec>
                        <exec>...test.debug...</exec>
                   </tasks>
              </serial>
          </tasks>
      </tasks>
    </parallel>
    <exec>...package..</exec>
</tasks>