Update PLN README to describe how to view the inference history
Update PLN README to describe how to view the inference history
Update PLN README to describe how to view the inference history
Add get_history method to AtomSpaceBasedInferenceHistory class used in PLN Chainer
Remove reference to deprecated history interface
Merge pull request #712 from cosmoharrigan/pln-history

Update PLN documentation to describe how to view inference history