Kill trailing whitespace in ruby files

app/helpers/artists_helper.rb

@@ -1,16 +1,16 @@
 module ArtistsHelper
   def link_to_artist(name)
     artist = Artist.find_by_name(name)
-    
+
     if artist
       link_to(artist.name, artist_path(artist))
     else
       link_to(name, new_artist_path(:name => name)) + " " + content_tag("span", "*", :class => "new-artist")
     end
   end
-  
+
   def link_to_artists(names)
-    names.map do |name| 
+    names.map do |name|
       link_to_artist(name)
     end.join(", ").html_safe
   end