Django-conditions

[Invalid tag, do not use]

- Add support for Django 2.0

- FIX: Add Django 1.11 support for conditions widget

- FIX: Improve Python 3.x compatibility for conditions widget (Thanks WarmongeR1! https://github.com/RevolutionTech/django-conditions/pull/1)
- Add support for Django 1.10-1.11
- Add support for Python 3.6
- Drop support for Python 3.3

- FIX: Prevent users from entering spaces into condition key and operand freetext

- UPGRADE: `django-jsonfield==1.0.1`