Add easy way to disable inventory tracking.

Currently inventory is always being tracked (resulting in backorders if not replenished).
This PR adds a simple NoopInventoryOperator and a configuration switch.
Be2bill onsite implementation
Add SecureNotifyAction
Rename NotifyAction
Update payment details
Update to PayumBundle 0.7.3
Add NotifyAction to payum config
Add amount to payment at creation
Add EventDispatcher dependency
Add Customer Welcome Email
Merge pull request #812 from winzou/be2bill-onsite

[Payum] Be2bill onsite implementation
Making address templates uniform and easier to centrally extend.
Rename LocaleListener::setRequestLocale
Rename RefreshCartListener::refreshCart
Rename OrderTaxationListener::applyTaxes
Rename OrderInventoryListener methods
Rename OrderStateListener:resolveOrderStates
[WebBundle] Fix version of knp-menu-bundle

Fix #887.
Fixing format so behat tests pass
Add ability for admins to log in as other users.