Added all non-fractional currencies

Was investigating an issue with non-fractional currencies and came across this bit of code that handles rounding for those currencies. I noticed that our list of non-fractional currencies was not exhaustive. So I added all the other currencies that do not have fractions (used http://en.wikipedia.org/wiki/ISO_4217 as a reference).

Not sure who best to ping for review on this so going with @odorcicd @jordanwheeler