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
Change product property field type to "text". 

Related to #868.
Merge pull request #872 from kayue/patch-2

Change product property field type to "text".
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.