Allow selecting available delivery country addresses only

During checkout process, customer have to select a delivery address.

Now, we will disabled addresses for which basket products cannot be delivered:

![capture decran 2014-03-31 a 16 05 56](https://cloud.githubusercontent.com/assets/103900/2568085/cbebbe72-b8dd-11e3-801e-3bcbe788d92d.png)

Also, when clicking on "edit" from checkout/basket process, customer can only select countries from which basket products can be delivered:

![capture decran 2014-03-31 a 16 05 01](https://cloud.githubusercontent.com/assets/103900/2568097/ec1b0004-b8dd-11e3-9fcf-b54a272741b5.png)