Added support for multiple attribute combination pricing.
Fixed item price in cart ajax requests.
Removed unused code from PC_controller_pc_shop class.
Removed unused code from PC_shop_cart class.
Removed item quantity limitations in PC_shop_cart class (temporarily).
Added support for handling 'add_to_basket' requests via AJAX.
Added support for color attributes (if value contains #RRGGBB in the end, then 'color' key is added to the attribute value data).
Removed all cart handling javascript code since it was buggy and did not go well according to design.
Rewritten PC_shop_product_model::get_price() and PC_shop_product_model::adjust_price().
Merge branch 'master' of https://github.com/profis/pc_shop.git into attribute_combinations

Conflicts:
	classes/PC_shop_site.php
Added several attributes required for order information.
Changed discount calculation method.
Fixed attribute combination parsing algrithm.
Modified products widget to use $_REQUEST instead of $_GET for paging.
Added quantity entering capability per attribute combination.
Modified attibute parsing to consider new quantity entries.
Added 'page' attribute to PC_plugin_pc_shop_products_widget.
Returned product quantity check to cart handling methods.
Added PC_shop_products_site::Get_product_quantity() method to get available quantity of the product by it's id and attribute collection.
Merge branch 'master' of https://github.com/profis/pc_shop into attribute_combinations

Conflicts:
	PC_plugin.js
	classes/PC_shop.php
Merge branch 'master' of https://github.com/profis/pc_shop into attribute_combinations
Changed product attribute dialog's info1 field type to allow selecting an image from the gallery.
Restored cart js file for merging back.
Fixed bug of receiving category attributes along with item attributes when getting items.
Modified cart javascript to be more flexible.
Fixed installation MySQL requests to apply changes correctly.