Added a new associate method, to associate a row in the cart with a model, so you can access the model from the CartRowCollection
Merge branch 'master' of git://github.com/Crinsane/LaravelShoppingcart
Little change to readme
Updates to readme.md
Merge pull request #33 from adamgoose/patch-1

Updates to readme.md
Added license
Merge branch 'master' of git://github.com/Crinsane/LaravelShoppingcart
support free products
Merge pull request #35 from jackmcdade/master

Product price can be (int) 0
add weight data
subtotal_weight on createRow
invalid variable name total_weight
add exception and methods description
add unit test
add weight data
Merge branch 'master' of https://github.com/yohang88/LaravelShoppingcart

Conflicts:
	src/Gloudemans/Shoppingcart/Cart.php