Merge pull request #810 from inthause/documents

Update document price storage
Add new 'internal' attribute on property of document model

By default property with internal attribute is excluded from REST interface
Update default document events

Remove EVENT_CREATE_LOCALIZED, use EVENT_UPDATE
EVENT_UPDATE is now dispatched on correction merged
Add \Rbs\Commerce\Cart\Cart::getPricesValueWithTax() method
Add 'internal' attribute on property 'Rbs_Order_Order::contextData' an 'Rbs_Order_Order::linesData'