fixes to conditionalhttp, et al

I noticed that conditionalhttp didn't seem to be working quite right.  It was 
returning a 304 status code, but then seemed to render all the content again 
anyhow.  I verified this behavior using ethereal and tracking the data passed 
back and forth.

So I began to poke around and I fixed a minor bug in the blosxom renderer (it 
would render, mark as rendered, but never checked the flag that it had rendered 
already), then a minor bug in the conditionalhttp plugin (it didn't whack the 
content, so the content would be rendered along with the 304 status code), and 
then fixed a bug in the rss2renderer (same problem as with the blosxom 
renderer).

Then I figured the rss2renderer should be in the contributed plugins pack, so I 
added that to the repository.

I checked all the changes I made in.

Anyhow, if you see any problems, let me know.

On another note, what happened to the push to put out a new contributed plugins 
pack for pyblosxom 1.2?  We promised that to the debian folks weeks ago.

/will


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