Added a Users view with some basic endpoints

The application is now beginning to take some shape.
run.py starts the flask app at 127.0.0.1:9999

The Users model has been updated with more columns from the db schema.
Two new methods - 'update' and 'json' have been added.

The view currently contains two GET endpoints which can be accessed
from /api

For handling the UUID as a part of the url, a UUID url converter for
Flask has been used from: https://github.com/wbolster/flask-uuid