The patch in #3 implements the feature partially. We still need a way to inco...

The patch in #3 implements the feature partially. We still need a way to incorporate the feature in this module.

Remaining tasks:

• Implement the feature in module
• Provide a setting so that user can opt whether or not he wants to change "add to cart" button text once item is added to cart
• Write tests

I'd be glad to have this feature in this module. Any help would be greatly appreciated.