[RELEASED][1.5.x] Quick Add-to-Cart by Model/Sku

What does it do:
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This contrib adds the ability to quickly add items to cart based on model or sku number.
Great for mail order catalogs that have a "Quick item" number.
Simply enter the number into the field and click "Add" to add it directly to cart.

Demo Video:
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http://screencast.com/t/L1HSMRDoKQ


Main features:
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* Unlimited module creation
* Search matches model or sku
* Completely Standalone. No core file edits
* Sideboxes can be placed anywhere (left, right, top, bottom)
* Sideboxes can be placed on any layout
* Sideboxes use the module system and can be enabled/disabled individually
* Sideboxes can have their own title configured from the admin with multilingual support