title: iText create document with unequal page sizes
body: <p>I want to create a pdf file using itext that has unequal page sizes. 
  I have these two rectangles: </p>
  
  <pre><code>Rectangle one=new Rectangle(70,140);
   Rectangle two=new Rectangle(700,400);
  </code></pre>
  
  <p>and i am writing to the pdf like this : </p>
  
  <pre><code>Document document = new Document();
    PdfWriter writer=  PdfWriter.getInstance(document, new FileOutputStream(("MYpdf.pdf")));
  </code></pre>
  
  <p>when I create the document, I have the option to specify the page size , but I want different page sizes for different pages in my pdf. 
  Is it possible to do that ?</p>
  
  <p>Eg. The first page will have rectangle one as the page size, and the second page will have rectangle two as the page size. </p>