Add support for `data-cart-render` and `data-cart-clear` APIs. Closes #8. Closes #11. 
Add support for `data-cart-render` and `data-cart-clear` APIs.
Closes #8.
Closes #11. 
michaelrshannon/cartjs,luisvillasenor/cartjs,discolabs/cartjs,michaelrshannon/cartjs,discolabs/cartjs