[PATCH] Make redirect_to support blocks.

With the new respond_with method, you can't provide the :location option that relies on an invalid object (that will raise a router error).

class UsersController < ApplicationController
  def create
    @user = User.create(params[:user])
    respond_with @user, :location => edit_user_path(@user)
  end

  def edit
    @user = User.find(params[:id])
    respond_with @user
  end
end

A solution for this is passing a block that can be executed later on.

class UsersController < ApplicationController
  def create
    @user = User.create(params[:user])
    respond_with @user, :location => proc { edit_user_path(@user) }
  end

  def edit
    @user = User.find(params[:id])
    respond_with @user
  end
end

I'm attaching a patch that fixes this issue.