replaced 404_handler.py with 404.py

hi all. i recently checked in rev 1093, which replaces contrib/404_handler.py 
with 404.py. 404.py is a simpler, more usable plugin for handling 404 not 
found errors with a custom page.

you simply create a 404 template for your flavour, e.g. 404.html if you use 
the html flavour, and include the html you want displayed. it provides $path, 
$path_stripped, and $title template variables, as well as the variables from 
your config.py.

you can see it in action at http://snarfed.org/404 , which returns a 404. that 
404 template uses google's ajax search api and ajax_search.js to show pages on 
your site that might be related to what the user was looking for. you can see 
the template here:

http://snarfed.org/404.snarfed

feel free to grab 404.py from svn and try it out!

http://pyblosxom.svn.sourceforge.net/viewvc/pyblosxom?view=rev&revision=1093

-Ryan

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