Changelog updated
Change Pony ORM version: 0.5.2-dev -> 0.5.2
Pony ORM release 0.5.2

http://blog.ponyorm.com/2014/08/11/pony-orm-release-0-5-2/

This release is a step forward to Python 3 support. While the external API wasn't changed, the internals were significantly refactored to provide forward compatibility with Python 3.

# Changes/features:

* New to_dict() method can be used to convert entity instance to dictionary. This method can be useful when you need to serialize an object to JSON or other format

# Bugfixes:

* Now select() function and filter() method of the query object can accept lambdas with closures
* Some minor bugs were fixed