- fields/format.js has been renamed into fields/formatters.js
- fields/parsers.js has been introduced
- parsers and formatters from l10n/numbers have been moved to
fields/parsers.js and fields/formatters.js
- same for parseCurrency and formatCurrency, and they have been
renamed into parse/formatMonetary
- humanReadable option is now a boolean, no longer a function
- formatPercentage implementation has been simplified thanks to
that reorganization
- tests have been reorganized accordingly