mbostock/d3 — pull request #1758 by salomvary (2014-02-27 22:29:25+00:00)
Title: pass in extra arguments to time.format.multi predicate functions

To be able to do something like this:

```javascript
var format = d3.format.multi([
['%Y', function(d, resolution) { return resolution === 'year'; }],
['%b, %Y', function(d, resolution) { return resolution === 'month'; }],
['%-d %b, %Y', function() { return true; }]
]);
format(date, 'month');
```

The performance and file size impact (+ 19 chars when minified) is minimal and it's 100% backwards compatible.