Make sure return values match title.

I received this error from the feeds:

AttributeError at /feeds/news/

'PressRelease' object has no attribute 'title'

Request Method: GET
Request URL: http://sfconservancy.org/feeds/news/
Django Version: 1.4.5
Exception Type: AttributeError

'PressRelease' object has no attribute 'title'
Exception Location: /var/www/conservancy/feeds.py in item_title, line 46

I think this change fixes that.