Use a bounds cache in sequentialflow.py, toher minor tweaks.
Merge branch 'dev' of github.com:OpenMDAO/OpenMDAO-Framework into bug
Merge branch 'dev' of github.com:OpenMDAO/OpenMDAO-Framework into bug
Merge pull request #1582 from setowns1/bug

 Use a bounds cache in sequentialflow.py, toher minor tweaks.