Twitter: use Module's timer support including proper shutdown

modules/Twitter.py

@@ -32,6 +32,11 @@ class Twitter(Module):
 
     """Access Twitter via the bot as an authenticated client."""
 
+    def timer_interval(self):
+        """Check for twitter updates every 300 seconds."""
+
+        return 300
+
     def __init__(self, irc, config, server):
         """Prepare for oauth stuff (but don't execute it yet)."""
 
@@ -92,6 +97,7 @@ class Twitter(Module):
     def shutdown(self):
         """Deauth, and make the twitter API item inoperable."""
 
+        Module.shutdown(self)
         self.twit.ClearCredentials()
         self.authed = False
 
@@ -233,12 +239,13 @@ class Twitter(Module):
 
             return 'The bot is now logged in.'
 
+    def timer_do(self):
+        """Check the timeline."""
+        self._check_self_timeline()
+
     def _check_self_timeline(self):
         """Check my timeline, and if there are entries, print them to the channel."""
 
-        # re-register this check
-        Timer(300, self._check_self_timeline, ()).start()
-
         if self.authed:
             # get the id of the last check we made
             since_id = self._get_last_since_id()