Kill trailing whitespace in ruby files

app/controllers/news_updates_controller.rb

@@ -1,33 +1,33 @@
 class NewsUpdatesController < ApplicationController
   before_filter :admin_only
   respond_to :html
-  
+
   def index
     @news_updates = NewsUpdate.order("id desc").paginate(params[:page])
     respond_with(@news_updates)
   end
-  
+
   def edit
     @news_update = NewsUpdate.find(params[:id])
     respond_with(@news_update)
   end
-  
+
   def update
     @news_update = NewsUpdate.find(params[:id])
     @news_update.update_attributes(params[:news_update])
     respond_with(@news_update, :location => news_updates_path)
   end
-  
+
   def new
     @news_update = NewsUpdate.new
     respond_with(@news_update)
   end
-  
+
   def create
     @news_update = NewsUpdate.create(params[:news_update])
     respond_with(@news_update, :location => news_updates_path)
   end
-  
+
   def destroy
     @news_update = NewsUpdate.find(params[:id])
     @news_update.destroy