title: Problems using C++ community plugin in sonar. Cppcheck doesn't work
body: <p>sonar doesn't launch cppcheck when I use sonar-runner.
  I'm using the last version off all (sonar, c++ community pluguin and sonar-runner) in ubuntu 12.04.</p>
  
  <p>If someone has sonar working correctly with cppcheck (and the other plugins too, but now I only need cppcheck), tell me how please.</p>
  
  <p>In the sonar dashboard of the project appears the number of lines of code, comments, quality index, technical debt,... and the rules compliance appears at 100% and it's not true, because the project has cppcheck errors.
  I'm sure that sonar doesn't launch cppcheck because running cppcheck takes 1-2 minutes, and sonar-runner shows 0ms in cppcheck section.</p>
  
  <p>Thank you!</p>