Add HPP Payment API endpoint#95

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SebAshton wants to merge 5 commits intoStemboltHQ:masterfrom

madetech:add-adyen-hpp-payment-api-endpoint

Commits on Sep 12, 2016

Commits on Sep 13, 2016

Commits on Sep 14, 2016

Return more approriate response for failures
SebAshton
committed