Support google.type.Money

[derekperkins]

There is already native helper support for google.protobuf.Timestamp, and while google.type.* aren't WKTs, they're pretty close. It should be pretty simple to generate similar helpers for money.

// Create our number formatter.
var formatter = new Intl.NumberFormat('en-US', {
  style: 'currency',
  currency: 'USD',

  // These options are needed to round to whole numbers if that's what you want.
  //minimumFractionDigits: 0, // (this suffices for whole numbers, but will print 2500.10 as $2,500.1)
  //maximumFractionDigits: 0, // (causes 2500.99 to be printed as $2,501)
});

formatter.format(2500); /* $2,500.00 */

code from: https://stackoverflow.com/a/16233919/1691542

cc @tannerlinsley