Kill trailing whitespace in ruby files

app/controllers/users_controller.rb

@@ -7,27 +7,27 @@ class UsersController < ApplicationController
     @user = User.new
     respond_with(@user)
   end
-  
+
   def edit
     @user = User.find(params[:id])
     check_privilege(@user)
     respond_with(@user)
   end
-  
+
   def index
     @users = User.search(params[:search]).order("users.id desc").paginate(params[:page], :search_count => params[:search])
     respond_with(@users)
   end
-  
+
   def search
   end
-  
+
   def show
     @user = User.find(params[:id])
     @presenter = UserPresenter.new(@user)
     respond_with(@user)
   end
-  
+
   def create
     @user = User.create(params[:user], :as => CurrentUser.role)
     if @user.errors.empty?
@@ -36,32 +36,32 @@ class UsersController < ApplicationController
     set_current_user
     respond_with(@user)
   end
-  
+
   def update
     @user = User.find(params[:id])
     check_privilege(@user)
     @user.update_attributes(params[:user], :as => CurrentUser.role)
     respond_with(@user)
   end
-  
+
   def upgrade
     @user = User.find(params[:id])
-    
+
     if params[:email] =~ /paypal/
       UserMailer.upgrade_fail(params[:email]).deliver
     else
       UserMailer.upgrade(@user, params[:email]).deliver
     end
-    
+
     redirect_to user_path(@user), :notice => "Email was sent"
   end
-  
+
   def cache
     @user = User.find(params[:id])
     @user.update_cache
     render :nothing => true
   end
-  
+
   def restore_uploaded_tags
     @user = User.find(params[:id])
     importer = UploadedTagsImporter.new(@user)