Use gevent for server, Manager for db migrations

manage.py

+from flask_script import Manager
+from flask_migrate import Migrate, MigrateCommand
+from canteeneo import app
+
+manager = Manager(app)
+manager.add_command('db', MigrateCommand)
+
+if __name__ == '__main__':
+    manager.run()

run.py

+from gevent.wsgi import WSGIServer
 from canteeneo import app
 
-if __name__ == "__main__":
-    app.run()
+http_server = WSGIServer(('0.0.0.0', 5000), app)
+http_server.serve_forever()
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