Restore the common.py file so that we can get the tests to pass
Restore the common.py file so that we can get the tests to pass

I don't want this change to turn into a restructuring hairball

joshzarrabi/e-mission-server,sunil07t/e-mission-server,e-mission/e-mission-server,sunil07t/e-mission-server,shankari/e-mission-server,yw374cornell/e-mission-server,yw374cornell/e-mission-server,e-mission/e-mission-server,shankari/e-mission-server,yw374cornell/e-mission-server,joshzarrabi/e-mission-server,e-mission/e-mission-server,sunil07t/e-mission-server,e-mission/e-mission-server,sunil07t/e-mission-server,joshzarrabi/e-mission-server,yw374cornell/e-mission-server,shankari/e-mission-server,joshzarrabi/e-mission-server,shankari/e-mission-server