Django-formidable

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- Clean up help_text migration (292)
- Freeze perf-rec version for the python 2.7

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Main Changes
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- Added a plugin mechanism, allowing users to define and integrate their own "business logic" fields (345).
- Extend the validation in the filler API to allow validation of extra fields (348).
- Refactoring of the field builder (Use only one module for the form builder factory) (347).
- Add `parameters` to the fields schema.
- Allow Fields and Widgets to introduce `parameters` when being stored as Formidable models instances (358).
- Added pytz as a requirement.
- Enforce support for Django REST Framework to the version 3.8.x ; **the 3.9 series is incompatible with our current codebase**.

Minor Changes
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- Upgrade to Circle-CI 2 (before the end of life of Circle-CI v1 on August, 31st 2018). (342)
- Optimize Circle-CI usage by using the tox matrix in tests (343)
- Change the global exception handling error level, from "error" to "exception". It'll provide better insights if you're using Logmatic or any other logging aggregator (336).
- Skip `tox` installation in the circle-ci environment: it's already there (344).

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- Django field `disabled` option are now set through the field builder (351).

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- Moved the injection of the JSON ``version`` into the serializer, rather than the ``Formidable.to_json()`` class method. The serializer is called by the method, so it's idempotent (340).

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- Added the JSON ``version`` when going through the ``Formidable.to_json()`` class method. This would ensure that stored schemas would carry their version and wouldn't need extra JSON schema migrations (337).

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- Deprecate support for Django 1.8 and Django 1.9 (325).
- Drop crowdin for translation handling (333).