Add object for creating page
user
```ruby
module Hubdown
  class PageBuilder
    
    def initialize body
      @body = body
    end

    def get_page
      page = "#{get_head}#{@body}#{get_closing}"
      page      
    end

    def get_head
    opening = <<EOF
    <!DOCTYPE html>
    <html>
    <head>
      <title>OUTPUT</title>
      <link href="https://a248.e.akamai.net/assets.github.com/assets/github-8dd5c1a834790ecb6b900ff7b2d9a1377fd5aef1.css" media="screen" rel="stylesheet" type="text/css" />
      <link href="https://a248.e.akamai.net/assets.github.com/assets/github2-4591451faf42b997173d752065f048736e6f9872.css" media="screen" rel="stylesheet" type="text/css" />
      <style>
        #wrapper {
          width: 920px;
          margin: 20px auto;
        }
      </style>
    </head>

    <body>
      <div id="wrapper">
      <div id="slider">
        <div class="frames">
          <div class="frame">
            <div id="readme" class="clearfix announce instapaper_body md">
              <span class="name">FILE_NAME</span>
              <article class="markdown-body entry-content">
EOF
    end

    def get_closing
      closing = <<EOF
                </article>
              </div>
            </div>
          </div>
        </div>
        </div>
      </body>
      </html>
EOF
    end
  end
end
```
assistant