Adopt build tool core and frontends?

Hi,

Given it would be fairly simple to extract the core out of grunt-umd and make it a library of its own I started thinking perhaps the project would belong below umdjs.

It would look like this:

• umdjs/build-core - Streaming library used by actual build tools
• umdjs/grunt-umd - The plugin just moves under this namespace and uses `build-core´
• umdjs/gulp-umd - Gulp plugin, same core.
• umdjs/-umd - plugin, same core.

The primary advantage of having the tools below the same namespace would be discoverability. In addition it would add some credibility to the build tools and allow more people (umdjs team) to maintain them.

Does this sound reasonable to you? I understand if you are busy and prefer to keep tooling outside of umdjs but there are certain benefits as outlined above.