Revert "Gollum::Wiki#pages come back sorted by title, not permalink or the default ordering from git ls-tree."

This reverts commit e37a8b9da4.

lib/gollum/wiki.rb

@@ -221,9 +221,7 @@ module Gollum
     #
     # Returns an Array of Gollum::Page instances.
     def pages(treeish = nil)
-      tree_list(treeish || 'master').sort! do |x, y| 
-        x.title.downcase <=> y.title.downcase
-      end
+      tree_list(treeish || 'master')
     end
 
     # Public: Returns the number of pages accessible from a commit