Jl/fix rmodel

[jeffzyliu]

Description

rewrites the npm r-model package to properly use stdin instead of env to pass data, as well as better error handling.

closes #169

Type of Change

• [ ] New feature
• [ ] Bug fix
• [ ] Breaking change
• [ ] Documentation update

Checklist

• [ ] Unit/integration tests
• [ ] Documentation

Tickets

• Issue Number