Django-cqrs

New Features:
* CQRS_SELECT_FOR_UPDATE option is added to ReplicaMixin to support automatic locking of records for replica save operations

Removal of Six Library

Fixes:
* Any exception in CQRS processing is handled in RabbitMQ consumer
* Removed excessive savepoints from transaction handling in consumer

* Tests folder is purged from installed package

New Features:
* Added sphinix documentation, available online at https://django-cqrs.readthedocs.io/en/latest/
* Added support to keep track of changes to fields

Fixes/improvements:
* F expressions for updates
* Fix for model private fields (GenericForeignKey)

Added integration tests for:

Master with latest version -> replica on version 1.3.1
Master with version 1.3.1 -> replica on latest version

Publish on github

use
- Travic-CI.org for CI
- SonarCloud.io for code validation
- codecov.io for coverage
- pypi.python.org for package publishing