Update screenshot script for changes to make example.
Update screenshot script for changes to make example.

It now waits for make example to process the db migrations before
selenium browses out.

It also handles toolbar already being open in the case of existing
cookies.

spookylukey/django-debug-toolbar,jazzband/django-debug-toolbar,tim-schilling/django-debug-toolbar,django-debug-toolbar/django-debug-toolbar,django-debug-toolbar/django-debug-toolbar,django-debug-toolbar/django-debug-toolbar,jazzband/django-debug-toolbar,jazzband/django-debug-toolbar,spookylukey/django-debug-toolbar,tim-schilling/django-debug-toolbar,tim-schilling/django-debug-toolbar,spookylukey/django-debug-toolbar