Kill trailing whitespace in ruby files

app/presenters/post_set_presenters/post.rb

@@ -7,7 +7,7 @@ module PostSetPresenters
       @post_set = post_set
       @tag_set_presenter = TagSetPresenter.new(related_tags)
     end
-    
+
     def related_tags
       if post_set.is_pattern_search?
         pattern_tags
@@ -21,28 +21,28 @@ module PostSetPresenters
         related_tags_for_group
       end
     end
-    
+
     def popular_tags
       n = 1
       results = []
-      
+
       while results.empty? && n < 256
         query = n.days.ago.strftime("date:>%Y-%m-%d")
         results = RelatedTagCalculator.calculate_from_sample_to_array(query).map(&:first)
         n *= 2
       end
-      
+
       results
     end
-    
+
     def pattern_tags
       Tag.name_matches(post_set.tag_string).all(:select => "name", :limit => Danbooru.config.tag_query_limit, :order => "post_count DESC").map(&:name)
     end
-    
+
     def related_tags_for_group
       RelatedTagCalculator.calculate_from_sample_to_array(post_set.tag_string).map(&:first)
     end
-    
+
     def related_tags_for_single
       tag = Tag.find_by_name(post_set.tag_string)
 
@@ -53,7 +53,7 @@ module PostSetPresenters
         tag.related_tag_array.map(&:first)
       end
     end
-    
+
     def tag_list_html(template)
       tag_set_presenter.tag_list_html(template)
     end