message: Update AddTaskPseudoRapidityDensity.C
  change on the AddTaskPseudoRapidityDensity
diff: - AliAnalysisPseudoRapidityDensityTemp* AddTaskTemp(const char* taskname, const char* option){
  + AliAnalysisPseudoRapidityDensity* AddTaskPseudoRapidityDensity(const char* taskname, const char* option){
  AliAnalysisManager *mgr = AliAnalysisManager::GetAnalysisManager();
  if (!mgr) {
  return 0x0;
  }
  - AliAnalysisPseudoRapidityDensityTemp *task = new AliAnalysisPseudoRapidityDensityTemp(taskname, option);
  + AliAnalysisPseudoRapidityDensity *task = new AliAnalysisPseudoRapidityDensity(taskname, option);
  AliAnalysisDataContainer *cinput = mgr->GetCommonInputContainer();
  AliAnalysisDataContainer *coutput = mgr->CreateContainer("output", TList::Class(), AliAnalysisManager::kOutputContainer,"AnalysisResults.root");
  mgr->AddTask(task);
  