fix processevents script, fix tox

docs/source/conf.py

old/__init__.py

old/app.py

old/config.py

old/environment.py

old/routes/api.py

old/routes/common.py

old/visit.py

setup.py

...ckout/stripe_checkout/management/commands/createprices.py

...kout/stripe_checkout/management/commands/processevents.py

stripe_checkout/stripe_checkout/management_views.py

stripe_checkout/stripe_checkout/models.py

stripe_checkout/stripe_checkout/stripe.py

stripe_checkout/stripe_checkout/urls.py

stripe_checkout/stripe_checkout/visit.py

stripe_checkout/stripe_checkout/visit_views.py

test/test_visit.py