Let the user finish the transaction with [SimplePurchase finishTransaction:t]#2

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ebekebe wants to merge 3 commits intochendry:masterfrom

Commits on Jul 23, 2014

Let the user finish the transaction with [SimplePurchase finishTransaction:t].
Benjamin Karran
committed

Commits on Aug 26, 2014

Fix index out of range exception if a wrong product id is passed.
Benjamin Karran
committed
Use NSLocalizedDescriptionKey instead of a hard coded string.
Benjamin Karran
committed