Updated example project for django 2.0

Merge pull request #37 from sodrooome/master

upgrade requirements to newer version

fixed ImproperlyConfigured

some improvement in settings.py

Add mandatory on_delete handler in model FKs

Merge pull request #30 from ShalbafZadeh/patch-1

Merge pull request #31 from d9ABon/serializers_deprecation

serializers AssertionError since 3.3.0

Update ALLOWED_HOSTS in settings file

Added docker-compose instructions to the Readme

Added docker-compose config

Fix missing queryset attribute

Upgraded to Django1.9 + DRF 3.3

Added migration for django 1.8 user model changes.