Multiple currencies

[samuelbirch]

It would be great if we could define vouchers per currency.

So we could create a £10 voucher and a $10 voucher.

We would then like to be able to display only vouchers in a certain currency to be purchased.

Then also restrict the redeeming of a voucher to the currency that it was purchased in.

[engram-design]

We might have to wait until Commerce itself allows for multi-store setup, as I believe right now a purchasable's price isn't localised per currency, or even per site. As per craftcms/commerce#24