Browersify build breaks with Require.js in browser

[rbkreisberg]

Using the current build of dagre.js with Require.js in browser results in errors related to references to graphlib and lodash.

I was able to resolve this by building it with the fix from:

dagrejs/dagre-d3#103

browserify index.js -s dagre > dist/dagre.js

I'm pushing this change shortly. Any ideas on an easy way to validate that this works automatically?

[rbkreisberg]

Probably a test written for PhantomJS?