remove unused db.py and add flake8 config

.flake8

@@ -0,0 +1,7 @@
+[flake8]
+# Rule definitions: http://flake8.pycqa.org/en/latest/user/error-codes.html
+# W503: line break before binary operator
+exclude = venv*,__pycache__,node_modules,cache,migrations
+ignore = W503
+max-complexity = 14
+max-line-length = 120

db.py

@@ -1,14 +0,0 @@
-from flask_script import Manager, Server
-from flask_migrate import Migrate, MigrateCommand
-
-from app import create_app, db
-
-
-application = create_app()
-
-manager = Manager(application)
-migrate = Migrate(application, db)
-manager.add_command('db', MigrateCommand)
-
-if __name__ == '__main__':
-    manager.run()