- Fixed Entity.get() for Python 3
- Switched from future to six Python 2/3 compatibility libraries because future's modified str does not play well with adapters.
- Added support for Python 3.6+
- Dropped support for Python <2.7
- Fix packages for pytest plugin
- Allow EntityFields to use dotted-name class strings. This was done to allow circular references in entities that may refer to one another.
- Added BytesField
- Allow empty values for URL