Redirected Pages are not Wanted Pages

Correct list of Wanted Pages. Should not
include redirected pages.
(Reported by Toby Bartels)

app/models/page_set.rb

@@ -83,12 +83,17 @@ class PageSet < Array
   # Returns all the wiki words in this page set for which
   # there are no pages in this page set's web
   def wanted_pages
-    wiki_words - web.select.names
+    known_pages = (web.select.names + redirected_names).uniq
+    wiki_words - known_pages
   end
 
   def names
     self.map { |page| page.name }
   end
+  
+  def redirected_names
+    self.wiki_words.select {|name| web.has_redirect_for?(name) }.uniq.sort
+  end
 
   def wiki_words
     self.inject([]) { |wiki_words, page|