nbproject: Manage Jupyter notebooks

nbproject is an open-source Python tool to help manage Jupyter notebooks with metadata, dependency, and integrity tracking. A draft-to-publish workflow creates more reproducible notebooks with context. There are a number of approaches to address reproducibility & manageability problems of computational R&D projects. nbproject complements - and should be combined with - approaches that are based on modularizing notebooks into pipelines, containerizing compute environments, or managing notebooks on centralized platforms.