Couple of feed issues

[TechyChap]

Was working with the OrderAdjustmentMessage / POST_PAYMENT_ADJUSTMENT_DATA today and spotted a couple of little issues.

In the XML for DirectPaymentAdjustments AdjustmentCurrencyAmount should be Amount and ItemPriceAdjustments is missing a "component"

e.g.

<ItemPriceAdjustments>
          <Type>Principal</Type>
          <Amount>24.99</Amount>
        </ItemPriceAdjustments>

should be

<ItemPriceAdjustments>
<Component>
          <Type>Principal</Type>
          <Amount>24.99</Amount>
</Component>
</ItemPriceAdjustments>

Will hopefully be able to send a PR next week.