Support for other Currency Codes when using different locale

[bvkimball]

The following don't work when not in the same locale as the currency.

abbrev	full	symbol
PLN	Polish Zloty	zł
CHF	Swiss Franc	CHF
AED	United Arab Emirates Dirham	AED
SGD	Singapore Dollar	$, S$
HUF	Hungarian Forint	Ft
DKK	Danish Krone	kr.
SEK	Swedish Krona	kr
NOK	Norwegian Krone	kr
ZAR	South African Rand	R

The issue is with then INTL libary only seems to support true currency symbols (ie. single character) from here:
http://www.fileformat.info/info/unicode/category/Sc/list.htm

Spec: http://www.ecma-international.org/ecma-402/1.0/#sec-6.3

We should create an override system for these scenarios to check if the currency code (PLN) is still in the formatted string replace with overrideString in a mapping we maintain.

Override should happen here: https://github.com/bullhorn/chomsky/blob/master/src/lib/formats.ts#L53