This project is not currently active. We have switched to bundling a JS wrapper into the core RDKit suite (https://github.com/rdkit/rdkit/tree/master/Code/MinimalLib) and currently plan to focus our efforts there.
More information is available in this RDKit blog post.
Guillaume Godin
https://github.com/rdkit/rdkit/tree/master/Code/MinimalLib