Pyramid-celery

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- Drop support for celery 3.0
- Drop support for Pyramid 2.7
- Error out if ini is misconfigured
- Add support for pyramid v2
- Add support for celery v5
- Drop support for old CELERY config options,
use only the lower case versions.
- Added support for `options` in celerybeat.
- Added support for `broker_transport_options`

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- Support celery 4.0
- Properly handle CELERY_ALWAYS_EAGER
- Handle tuple in ADMINS