Kill trailing whitespace in ruby files

app/controllers/favorites_controller.rb

@@ -1,6 +1,6 @@
 class FavoritesController < ApplicationController
   before_filter :member_only
-  
+
   def index
     if params[:tags]
       redirect_to(posts_path(:tags => params[:tags]))
@@ -8,7 +8,7 @@ class FavoritesController < ApplicationController
       @favorite_set = PostSets::Favorite.new(CurrentUser.user, params[:page])
     end
   end
-  
+
   def create
     if CurrentUser.favorite_limit.nil? || CurrentUser.favorite_count < CurrentUser.favorite_limit
       @post = Post.find(params[:post_id])
@@ -17,7 +17,7 @@ class FavoritesController < ApplicationController
       @error_msg = "You can only keep up to #{CurrentUser.favorite_limit} favorites. Upgrade your account to save more."
     end
   end
-  
+
   def destroy
     @post = Post.find(params[:id])
     @post.remove_favorite!(CurrentUser.user)