Added updated implementation for curriculum-learning supported agents and environments. Added docs and examples for using the curriculum learning functionality.

See #60

First major release of conformer-rl. Includes interface for training agents on general molecules files and implementations of all components for reproducing results in "TorsionNet: A Reinforcement Learning Approach for Conformer Generation" paper.

State of the repository leading up to the submission of the TorsionNet paper in June 2020.