Updated generated form "action" URLs to no longer include duplicate parameters for “products_id” when the page URL includes “products_id” as a parameter.
Merge pull request #22 from lhungil/v160-product-listing-cleanup-form-params

Cleanup the form action URLs generated on the product listing pages
CHANGE-484 - Quantities added to cart should adjust to stock rather than just a message
ISSUE-51 - Add ability to autoload observer classes without needing to also create auto_loaders scripts
ISSUE-52 - Change admin rules to allow pass "phrases" by permitting the use of spaces
CHANGE-616 210291: PHP 5.4.12, PHP Warning: Illegal string offset 'cost'
Update $_SESSION['shipping'] validations
Merge pull request #34 from zencart/v160

V160