dc-js/dc.js — pull request #813 by QuinnLee (2014-12-28 05:34:18+00:00)
Title: calculateColorDomain(); to return chart

The `calculateColorDomain()` doesn't return `_chart`. I think this function to return `_chart`. Also, it might be ideal to pass in a argument `true` to fit in with the convention followed by other functions e.g `elasticY(true)`.

Let me know what you think!