Fix feed handling bug backwards compatibly. No name changes.

examples/example.coleslawrc

            (:tag-index      "tag/~a")
            (:month-index    "date/~a")
            (:numeric-index  "~d")
-           (:standard-feed  "~a.xml")
+           (:feed           "~a.xml")
            (:tag-feed       "tag/~a.xml"))
  :sitenav ((:url "http://redlinernotes.com/" :name "Home")
            (:url "http://twitter.com/redline6561" :name "Twitter")

src/feeds.lisp

 
 ;;; Atom and RSS Feeds
 
-(defclass feed () ((format :initarg :format :reader feed-format)))
+(defclass base-feed () ((format :initarg :format :reader feed-format)))
 
-(defclass standard-feed (index feed) ())
+(defclass feed (index base-feed) ())
 
-(defmethod discover ((doc-type (eql (find-class 'standard-feed))))
+(defmethod discover ((doc-type (eql (find-class 'feed))))
   (let ((content (by-date (find-all 'post))))
     (dolist (format '(rss atom))
-      (let ((feed (make-instance 'standard-feed :format format
+      (let ((feed (make-instance 'feed :format format
                                  :content (take-up-to 10 content)
                                  :slug (format nil "~(~a~)" format))))
         (add-document feed)))))
 
-(defmethod publish ((doc-type (eql (find-class 'standard-feed))))
-  (dolist (feed (find-all 'standard-feed))
+(defmethod publish ((doc-type (eql (find-class 'feed))))
+  (dolist (feed (find-all 'feed))
     (write-document feed (theme-fn (feed-format feed) "feeds"))))
 
 ;;; Tag Feeds
 
-(defclass tag-feed (index feed) ())
+(defclass tag-feed (index base-feed) ())
 
 (defmethod discover ((doc-type (eql (find-class 'tag-feed))))
   (let ((content (by-date (find-all 'post))))