find by id should crawl detailed content

[sathish316]

find by id returns same content as find all.

find by id should optionally crawl detailed pages and return more content

Example:

class IMDB
  include Scrapify::Base
  html "http://imdb.com/top250"
  attribute :rank, css: ".rank"
  attribute :title, css: ".title
  attribute :url, xpath: "//a[@class='movie']/@href"

  crawl using: url do |page|
    page.attribute :release_date, css: ".release_date"
    page.attribute :storyline, css: ".storyline"
    page.attribute :full_cast, css: ".full_cast" {|e| e.children.css('.name').map(&:value)}
  end
end