ES6 - updaing version from package.json

[kum-deepak]

Ref #1520

Earlier the concat grunt task was placing the version number. Current thinking to factor only version to a file (module) of its own and only pass that through grunt processor.

[gordonwoodhull]

So the module would be generated from package.json instead? Sounds reasonable.

[kum-deepak]

I was thinking of one template file and use grunt to generate the actual version.js

[kum-deepak]

Currently, also, it is generated from package.json.

[kum-deepak]

Please check commit d635e49, close the task if you are happy with the approach.

[gordonwoodhull]

There may be a simpler way to do this (poke around and see how D3 uses rollup for this), but I'm cool with this for now. Thanks!