Update requirements.txt
Switch data storage to an SQLite database

Using the peewee ORM.
200 MB JSON files were insufficiently performant.
Log time taken to retrieve tweets from twitter
Make latest_id an instance attribute
Handle and log failures to update the timeline
Specify a default value for the since_id argument that will cast to long
Fix the arguments for run() when --foreground is specified
Improve visual alignment in nginx.conf
Proxy requests for other endpoints to twitter over SSL

No need for communication between the app and twitter to be insecure.