Moved PRP and UoM into a Product domain with Product.
Added awesome helper function for price request
Merge branch 'master' of https://github.com/billforward/bf-php

Conflicts:
	lib/BFPHPClient/Entities/PricingCalculator/PriceRequest.php
	test/BFPHPClientTest/OneOffTests/PricingCalculatorTest_OneOff.php