Preview`s CSS links relocated to the header template.
Adding Youtube video support for Welcome view.
If user is not logged in and associative array has no key like `user_id` then instead of error NULL is returned using isset() function.
Adding backround logic for a shopping cart. Server side, scripting.
Adding HTTPS JavaScript libraries loading.
First version of Pinterest supporting library including OEmbed added.
Response type of oEmbed call taken in consideration.