[author] dc.js 1.7.0

This is just a RequireJS/AMD-compatible release of the popular dc.js charting library.

I am a relatively new maintainer of dc.js, so please lmk if I'm doing anything wrong here.

The project URL is https://github.com/dc-js/dc.js

Note this is a domain change, which is reflected in the package.json.  We transferred the project to an organization a few months ago.

Thank you!