Pushing the changes from ramyaps:fork to the updownlife:master Nov 5th

Updated the code logic for product_detail.php, orer.php and order_detail.php. 
Updated style.css for new style properties. 
Added few coments to sell.php. 
Created user.php for functions/methods for selecting from user table repeatedly.
including some image files for the products created in testing yesterday.

Thanks,
Ramya