Add a vault to PostDeliveryCrowdsale. #1721
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Fixes #1595.
PostDeliveryCrowdsalepostpones the moment in which_deliverTokensis called until withdrawal time, which cause validation issues. For example,AllowanceCrowdsalecallstransferFromon_deliverTokens, so there are no guarantees that the tokens will actually be there once the crowdsale ends. Additionally, because the allowance was not being used, the number of tokens remaining was not updated. A similar scenario happens on aMintedCrowdsalewith anERC20Cappedtoken.This fixes that by calling
_deliverTokensat the moment of purchase, transferring them to a contract that will hold them untilPostDeliveryallows for withdrawal (a mini token escrow).