Data equivalency

[northdpole]

closes #149

• [x] create a way to diff two cre databases
• [x] create a script that diffs the latest data with the heroku state
• [ ] write tests
• [ ] write a github cronjob that notifies on github data differences to heroku

[northdpole]

https://stackoverflow.com/questions/58734306/dynamically-linking-to-databases-using-flask-sqlalchemy https://stackoverflow.com/questions/7923966/flask-sqlalchemy-with-dynamic-database-connections