py-stone: updated to 3.3.1

v3.3.1

Small fix to --attribute-comment in backend python client.

v3.3.0

Python

Add attrs export to python client

ApiRoute

ApiRoute: Provide a hash implementation, too.
Add sorting of ApiRoute, guaranteeing stable file output.

Objective C

Fix obj_c types to not overwrite jsonDict with nil
Synchronize access to route singletons
Added Bytes as a primitive that doesn't require serialization
Fix objc generation for Bytes property and for hash methods with switch statements

JavaScript/TypeScript

Fix wrap_error_in generation for TS client
Fix imports for TS autogenerated imports
Add ability to wrap errors in a custom error class for JS/TS
Add ability to dynamically import namespaces from types in the tsd client
Make extra parameters optional for JS/TS backends

(adam)