Enhance swf errors wrapping via an exception helper
Update worker and deciders actors to use SWFError subclasses exceptions
Merge pull request #32 from botify-labs/feature/further_error_handling_refactoring

Feature/further error handling refactoring
Merge branch 'release/0.1.31' into develop
Merge branch 'develop' of github.com:botify-labs/python-simple-workflow into develop
Merge branch 'develop'