Fix angular version used in front
Update document price storage.

Delete 'Rbs_Price_Price/boEditWithTax', 'Rbs_Price_Price/defaultValue', 'Rbs_Price_Price/boValue' and 'Rbs_Price_BillingArea/boEditWithTax' properties.
Add 'Rbs_Price_Price/value' and  'Rbs_Store_WebStore/pricesValueWithTax' properties.
Add \Rbs\Price\PriceInterface::isWithTax()
Merge pull request #810 from inthause/documents

Update document price storage