PRD-4483 - Add error handling for external tool launch failure
PRD-4556: Cleaned up.
Merge pull request #122 from pentaho-skarmali/PRD-4556_performance_measurements

PRD-4556: Cleaned up performance test cases
Merge pull request #120 from pentaho-tband/PRD-4483

PRD-4483 - Add error handling for external tool launch failure