AttributeError in QUIT handler due to method name mismatch

```
ERROR 2014-01-11 20:50:37,481 kitnirc.client:0222 - Error while processing event 'LINE': AttributeError("'Channel' object has no attribute 'remove'",)
Traceback (most recent call last):
  File "/home/shrdlu/.local/lib/python2.7/site-packages/kitnirc/client.py", line 217, in dispatch_event
    if handler(self, *args):
  File "/home/shrdlu/.local/lib/python2.7/site-packages/kitnirc/client.py", line 582, in on_line
    parser(client, command, actor, args)
  File "/home/shrdlu/.local/lib/python2.7/site-packages/kitnirc/client.py", line 685, in _parse_quit
    chan.remove(actor)
AttributeError: 'Channel' object has no attribute 'remove'
```