Revert "Make non English title indexable (such as Chinese or Japanese) using MD5."

This reverts commit 70e0edf0.

guides/rails_guides/indexer.rb

@@ -59,9 +59,8 @@ def process(string, current_level=3, counters=[1])
 
     def title_to_idx(title)
       idx = title.strip.parameterize.sub(/^\d+/, '')
-      if idx.blank?
-        puts "BLANK ID: please put an explicit ID for section #{title}, as in h5(#my-id)" if warnings
-        idx = ("id-"+Digest::MD5.hexdigest(title.strip)).parameterize.sub(/^\d+/, '')
+      if warnings && idx.blank?
+        puts "BLANK ID: please put an explicit ID for section #{title}, as in h5(#my-id)"
       end
       idx
     end