The Windows installation section has been revised to reflect updates with Node. Now each Mac, Windows, and Linux Installation Instructions should include the following snippet:

Stencil requires the Node.js runtime environment, version 6.x or later.

And all usage of any versions below Node 6.x should be deprecated.

Furthermore, the Handlebars Helpers Reference now links to the bigcommerce/paper-handlebars repository for developers to submit PRs for new custom helper suggestions.