Kill trailing whitespace in ruby files

app/presenters/post_set_presenters/popular.rb

@@ -2,7 +2,7 @@ module PostSetPresenters
   class Popular < Base
     attr_accessor :post_set, :tag_set_presenter
     delegate :posts, :date, :min_date, :max_date, :to => :post_set
-    
+
     def initialize(post_set)
       @post_set = post_set
     end
@@ -10,42 +10,42 @@ module PostSetPresenters
     def prev_day
       date - 1.day
     end
-    
+
     def next_day
       date + 1.day
     end
-    
+
     def prev_week
       date - 7.days
     end
-    
+
     def next_week
       date + 7.days
     end
-    
+
     def prev_month
       1.month.ago(date)
     end
-    
+
     def next_month
       1.month.since(date)
     end
-    
+
     def link_rel_for_scale?(template, scale)
       (template.params[:scale].blank? && scale == "day") || template.params[:scale].to_s.include?(scale)
     end
-    
+
     def next_date_for_scale(scale)
       case scale
       when "Day"
         next_day
-        
+
       when "Week"
         next_week
-        
+
       when "Month"
         next_month
-        
+
       else
         nil
       end
@@ -55,41 +55,41 @@ module PostSetPresenters
       case scale
       when "Day"
         prev_day
-        
+
       when "Week"
         prev_week
-        
+
       when "Month"
         prev_month
-        
+
       else
         nil
       end
     end
-    
+
     def nav_links_for_scale(template, scale)
       html = []
       html << '<span class="period">'
       html << template.link_to(
-        "&laquo;prev".html_safe, 
+        "&laquo;prev".html_safe,
         template.popular_explore_posts_path(
-          :date => prev_date_for_scale(scale), 
+          :date => prev_date_for_scale(scale),
           :scale => scale.downcase
         ),
         :rel => (link_rel_for_scale?(template, scale.downcase) ? "prev" : nil)
       )
       html << template.link_to(
-        scale, 
+        scale,
         template.popular_explore_posts_path(
-          :date => date, 
+          :date => date,
           :scale => scale.downcase
-        ), 
+        ),
         :class => "desc"
       )
       html << template.link_to(
-        "next&raquo;".html_safe, 
+        "next&raquo;".html_safe,
         template.popular_explore_posts_path(
-          :date => next_date_for_scale(scale), 
+          :date => next_date_for_scale(scale),
           :scale => scale.downcase
         ),
         :rel => (link_rel_for_scale?(template, scale.downcase) ? "next" : nil)
@@ -97,7 +97,7 @@ module PostSetPresenters
       html << '</span>'
       html.join("\n").html_safe
     end
-    
+
     def nav_links(template)
       html =  []
       html << '<p id="popular-nav-links">'
@@ -107,7 +107,7 @@ module PostSetPresenters
       html << '</p>'
       html.join("\n").html_safe
     end
-    
+
     def range_text
       if min_date == max_date
         date.strftime("%B %d, %Y")