Django-mptt

* Add support for Django 1.11 and 2.0
* Drop unsupported django versions from test matrix (1.9, 1.10)
* Add Danish and Ukrainian translations
* Rollup the last year worth of minor bug fixes

- Better support for Django 1.10
- Updated German and French translations
- Add Chinese (traditional), Hungarian and Finnish translations
- Remove tests folder from package (again.)

- Add support for django 1.10

- Numerous bug fixes (132, 453, 473, 475, 465 , 428)
- Compatibility with django 1.10rc1

- build tweaks (450, 456)
- Update russian translation

Fixed build