Additional resources in watch mode

[matt-gadd]

Enhancement
Now we have the ability to leverage node modules during build time render, we can build tooling that dynamically read resources that then get processed and included in the bundle. Because these resources are not directly/statically imported webpack does not currently watch them. This is a bit cumbersome if say working on a blog and updating some markdown, i'd like to be able to see my changes with a watch.

If we leverage https://github.com/pigcan/extra-watch-webpack-plugin, we should be able to watch everything other than node_modules in a dojo project.