Specify module dependencies.

While dc.js has code to make it usable as CommonJS module,
it does not require its dependencies, so when using browserify,
both d3 and crossfilter still has to be present as window globals.

This patch adds necessary require call, and the code using dc.js
can now be bundled into a single js file.
more doc artifacts
will the doc artifact churn never end?
more churn
Merge pull request #773
update version

for module dependency fixes in #773
Merge branch 'master' of github.com:wssbck/dc.js
Bringing master in sync with dc.js upstream
Basic tests for legend auto width