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
Merge pull request #812 from winzou/be2bill-onsite

[Payum] Be2bill onsite implementation