Kill trailing whitespace in ruby files

app/controllers/dmails_controller.rb

@@ -9,19 +9,19 @@ class DmailsController < ApplicationController
     else
       @dmail = Dmail.new(params[:dmail])
     end
-    
+
     respond_with(@dmail)
   end
-  
+
   def index
     @search = Dmail.visible.search(params[:search])
     @dmails = @search.order("dmails.created_at desc").paginate(params[:page])
     respond_with(@dmails)
   end
-  
+
   def search
   end
-  
+
   def show
     @dmail = Dmail.find(params[:id])
     check_privilege(@dmail)
@@ -33,20 +33,20 @@ class DmailsController < ApplicationController
     @dmail = Dmail.create_split(params[:dmail])
     respond_with(@dmail)
   end
-  
+
   def destroy
     @dmail = Dmail.find(params[:id])
     check_privilege(@dmail)
     @dmail.destroy
     redirect_to dmails_path, :notice => "Message destroyed"
   end
-  
+
   def mark_all_as_read
     Dmail.visible.unread.each do |x|
       x.update_column(:is_read, true)
     end
   end
-  
+
 private
   def check_privilege(dmail)
     if !dmail.visible_to?(CurrentUser.user)