REST API endpoint for pushing jupyter notebook to central git repo

[tbonza]

Okra command line makes a POST request to our server with a reported Jupyter notebook. The server performs validation steps, then pushes the notebook to a central git repo. This central git repo acts as a coordination mechanism to allow shared computational work across users (team work makes the dream work)

1. REST API must be up and running, able to accept post requests, and write validated Jupyter notebook to central git repo
2. This process should happen via a prompt...

$ okra compute https://github.com/okrahealth/okra.git

    Would you like to git clone 'https://github.com/okrahealth/okra.git'? [y]n
     ...
    Would you like to share work and share the analytics report? [y]n

We should include default agreement options for the above two prompts