title: Save cart on the current session
body: <p>I'm building a wordpress ecommerce site with the woocommerce plugin, it turns that when an user gets logged in and add products to his cart, but the user don't want to proceed to the checkout process, the user prefers to logout and continue with the checkout process later... when the user comes back and gets logged in again the cart is empty. </p>
  
  <p>What is going on here?. 
  Is this a normal behavior of woocommerce?. 
  Do I have to do something else? maybe a plugin?</p>
  
  <p>Thanks.</p>