Add pypify.py - "pip install" one-liners

## Summary Add another processing script - `pypify.py` to apply to `README.md` after `sort.py`. This script will add one-liners to each _installable_ library / package in README.md with a script to install it through pip. These one-liners are scraped from PyPI. See docs in `pypify.py`. **EXAMPLE:** Current line featuring the flower package: ``` * [flower](https://github.com/mh.