[CartBundle] Removed redundant cart refresh

Cart refresh is already handled by RefreshCartListener which subscribes to SyliusCartEvents::CART_CHANGE. That event is already dispatched along cart-changing events such as SyliusCartEvents::ITEM_REMOVE_INITIALIZE and therefor refreshCart() should be removed from CartListener
Added Order helpers to clear adjustments (with specs)
Merge pull request #1322 from boskee/remove-extra-refresh

[CartBundle] Removed redundant cart refresh
Merge pull request #1323 from elliot/feature/order-helpers

[OrderBundle] Add helpers to clear adjustments
Merge branch 'master' of https://github.com/Sylius/Sylius