release 4.39

• dropped support for Python 2.6 and Python 3.2. Supported versions are now 2.7, 3.3, 3.4 and up.
• better exception when message size exceeds 2 gigabyte limit
• mentioned the 2 gigabyte message size limit in the docs
• added auto retry mechanism, MAX_RETRIES config item, and autoretry example.
• API CHANGE: the instance_creator function passed to @expose now get the class as a single parameter when invoked by Pyro
• removed test suite dependencies on unittest2 (was used for Python 2.6)
• greatly improved the messagebus example, it now contains a persistent storage as well
• can now deserialize sqlite3 exceptions as well (without the need of registering custom class serializers)
• serialized proxies now gets the timeout and retries properties from the active config settings rather than from the serialized data
• new MessageTooLargeError when the max message size is exceeded (subclesses ProtocolError, which was the old error thrown in this case)