Send real payment's value to brightpearl
Merge branch 'master' of github.com:crowdint/spree_brightpearl

* 'master' of github.com:crowdint/spree_brightpearl:
  Don't save to payments to brightpearl if they are not completed
  Use a guard clause instead of wrapping the code inside a conditional expression
  Little refactor
  Fix failing test
  After send order to Bp, send payment too if payment is completed
  Added support to update brightpearl products price
  Get brightpearl id from Spree Product master