Add provider_closed field and populate it when a provider closes a case
Add provider_accepted and refactored cla_provider case list queryset
Add datamigration for provider_accepted and provider_closed
Added CORS support for provider extract API view.
Merge pull request #224 from ministryofjustice/feature/closed_cases

Feature/closed cases
INSUF, ABND, TERM are now HIGH and suspend cases
Provider CSV Upload feature
with minimal business spec validation
Merge pull request #225 from ministryofjustice/feature/csvupload-backend

Provider CSV Upload feature
Refactored out-of-hours utils to use cla_common code
Refactored opening hours into class and moved into cla_common
Add dependency on requests