Template Module

[nbelzer]

Adds a template module.

Please look at the template module README for instructions.

• Introduces a flask web app that can be run in development mode (using the flask devserver) or in production mode using uWSGI.
• Allows configuration of the application using configuration files in yaml format (this was chosen over arguments as I could not find a way to pass arguments to the WSGI application).
• Introduces a generic database interface used by both the postgres and Cassandra implementations.
• The person implementing the microservice likely only needs to touch routes.py and the files in database/.

I've documented the files so please look through them. I tried to think of all our use cases so I think the implementation is quite complete.

[nbelzer]

~I just need to check if the database connections actually work using some docker images.~ Made some changes, works now!