Fixed discount promotion calcutaion
Spec and test fix for percent discount
My account / addresses :  - improving Behat tests  - delete cascade on table sylius_user_address  - listener to directly add the address to the current user (when an address is created) and to directly unset billing and shipping to the user (when an address is deleted)  - main featurees
Fix Shipping Adjustment application

Currently ShippingChargesProcessor only adds shipping adjustments. This commit makes it remove already applied adjustments before applying new ones.
Also adds to the spec tests.
Merge pull request #370 from Richtermeister/fix-shipping-adjustments

Fix Shipping Adjustment application
Merge pull request #352 from antonioperic/fixing-promotion

Fixing promotion percent calculation
Allow to add product with 0.00 price
Test than the product price cannot be negative
Merge pull request #314 from jjanvier/feature/my-addresses

[WIP] My account section : address book