use npm scripts instead of grunt?

[tomwayson]

Creating a new issue for #77 (comment) since #80 is working w/ grunt and there's no need make the switch to npm scripts at this time.

Let's carry on the npm scripts conversation over here.

[gavinr]

To continue the planning on this item:

• the gruntfile we currently create:
  • watches for file changes (grunt-contrib-watch ), then
  • cleans (grunt-contrib-clean) and transpiles (grunt-babel) the source files to the dist folder, then
  • syncs (grunt-sync) the dist folder to the 2 WAB destination folders.

We will need to build equivalent workflow using terminal commands that are all cross-platform (Probably use https://www.npmjs.com/package/cross-env or an equivalent?)

Ideally this process will make the build/copy process FASTER and more resilient too to close #95.