SONATA-427 - Fix products final review templates + add login stepper

I've updated products templates and added login template into sandbox to add checkout stepper when needed.

Stepper looks like this:

![capture decran 2014-02-05 a 14 15 58](https://f.cloud.github.com/assets/103900/2087216/b8d270d8-8e67-11e3-8cf1-27cedcb9854d.png)

This is related to ecommerce PR https://github.com/sonata-project/ecommerce/pull/134