Programatically generate a analytics report in Jupyter notebook from cloned repo

[tbonza]

This is the full functionality for our pre-alpha version. We want to (a) clone a repo, (b) analyze the repo, (c) repo the results of analysis in a Jupyter notebook. This feature should

1. Clone repo, analyze repo, report repo in Jupyter notebook. Both repo and Jupyter notebook will be written to your working directory as a default option.

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

    Would you like to git clone 'https://github.com/okrahealth/okra.git'? [y]n

2. Specify directories for cloned repo and Jupyter Notebooks with permission specified
   for cloning a repo

$ okra compute -y https://github.com/okrahealth/okra.git \
                  -d /tmp/reports/ --clonedir /tmp/code/