UnicodeDecodeError: 'ascii' codec can't decode byte 0xef in position 8: ordinal not in range(128)

Nobody has claimed this yet.

I've an UWSGI-based irclog2html deployment that fails to render the index page with the following error:

```
Traceback (most recent call last):
File "/opt/irclog2html/local/lib/python2.7/site-packages/irclog2html/irclogserver.py", line 213, in application
dir_listing(stream, chan_path)
File "/opt/irclog2html/local/lib/python2.7/site-packages/irclog2html/irclogserver.py", line 116, in dir_listing
% (quote_plus(channel.name), escape(channel.name)),
File "/opt/irclog2html/local/lib/python2.7/site-packages/irclog2html/irclog2html.py", line 354, in escape
s = s.replace('&', '&').replace('<', '<').replace('>', '>').replace('"', '"')
UnicodeDecodeError: 'ascii' codec can't decode byte 0xef in position 8: ordinal not in range(128)
```

This is on Python 2.7.

My irclogs tree has a directory named `'#gnome-'$'\020''�s��'$'\177'`, which is a result of a terrible irssi accident, I expect.

Start with irclogserver.py at dir_listing and irclog2html.py at escape, then reproduce the index-page failure using the malformed directory name described in the report. Trace how the channel name is passed into quote_plus and escape; done means the index renders without this UnicodeDecodeError while handling that directory name.

Written by the indexing model from the issue text.