Disable logging from imported modules

The logging from imported modules (stem, in particular) has caused quite
a few users to assume there are errors where there aren't any. The logs
from stem also aren't helpful, as everything in the library works as
expected despite the implication from the logs that it is not working.

app/__init__.py

@@ -4,6 +4,7 @@ from app.utils.bangs import gen_bangs_json
 from flask import Flask
 from flask_session import Session
 import json
+import logging.config
 import os
 from stem import Signal
 from dotenv import load_dotenv
@@ -74,3 +75,9 @@ Session(app)
 send_tor_signal(Signal.HEARTBEAT)
 
 from app import routes  # noqa
+
+# Disable logging from imported modules
+logging.config.dictConfig({
+    'version': 1,
+    'disable_existing_loggers': True,
+})