Fix PyPI version 0.6.5

Correct matplotlib version

Fix version 0.6.3, minor fixes, docs update

Update to version 0.6.2

Version 0.6.1

Fix version 0.6.0, clean setup and other files

Merge branch 'master' of github.com:tensorforce/tensorforce

version upgrade, minor changes

version upgrade

combined state/action_value to value, other improvements