Add comments to clarify intent

Clarify the intent of both 'j' and 'connect' options of pymongo.MongoClient().

closes #123

api/config.py

@@ -75,10 +75,10 @@ if not os.path.exists(__config['persistent']['data_path']):
 
 db = pymongo.MongoClient(
     __config['persistent']['db_uri'],
-    j=True,
+    j=True, # Requests only return once write has hit the DB journal
     connectTimeoutMS=__config['persistent']['db_connect_timeout'],
     serverSelectionTimeoutMS=__config['persistent']['db_server_selection_timeout'],
-    connect=False,
+    connect=False, # Connect on first operation to avoid multi-threading related errors
 ).get_default_database()
 log.debug(str(db))