Changes
- Fix: Occasional KeyError during --restart (582, Christopher "CJ" Ketchum)
- Fix: Chained jobs overwrite each other's statistics with --stats (624, Christopher "CJ" Ketchum)
- Improve performance of --restart (Adam Novak)
- Fix: Mesos batch system doesn't favor bigger tasks (624, Hannes Schmidt)
- Various CWL integration fixes (Peter Amstutz, Kyle Elrott)
- Fix: Permission denied when adding files to job store that are not owned by current user (Adam Novak)