DrBotIRC: add support for ignoring all events from a nick

rudimentary for the moment. pop something like this in your config:

[Ignore]
nick_to_ignore = 1

DrBotIRC.py

@@ -104,6 +104,19 @@ class DrBotIRC(irclib.IRC):
     def _handle_event(self, connection, event):
         """Override event handler to do recursion."""
 
+        try:
+            nick = irclib.nm_to_n(event.source())
+        except (IndexError, AttributeError):
+            nick = ''
+
+        try:
+            if self.config.has_section('Ignore'):
+                alias = self.config.get('Ignore', nick)
+                if alias:
+                    print("ignoring " + nick + " as per config file")
+                    return
+        except NoOptionError: pass
+
         self.try_alias_cmds(connection, event)
         self.try_recursion(connection, event)
         self.try_alias(connection, event)