Kill trailing whitespace in ruby files

app/controllers/sessions_controller.rb

@@ -2,24 +2,24 @@ class SessionsController < ApplicationController
   def new
     @user = User.new
   end
-  
+
   def create
     session_creator = SessionCreator.new(session, cookies, params[:name], params[:password], params[:remember])
-    
+
     if session_creator.authenticate
       redirect_to(params[:url] || session[:previous_uri] || posts_path, :notice => "You are now logged in.")
     else
       redirect_to(new_session_path, :notice => "Password was incorrect.")
     end
   end
-  
+
   def destroy
     session.delete(:user_id)
     cookies.delete(:cookie_password_hash)
     cookies.delete(:user_name)
     redirect_to(posts_path, :notice => "You are now logged out.")
   end
-  
+
   def sign_out
     destroy()
   end