Separate distribution files for commonJS module?

This topic was originally raised at https://github.com/jquery/globalize/issues/441#issuecomment-121993133 by @jquense.

The scope and details of this change needs clarification. But, it's about decoupling CJS support from the UMD files. So, in the end we'll have two separate set of files: one for AMD/Globals and another one for CJS. Details...

What are the pros and cons of building separate distribution files for commonJS module?

Pros:
- Allow webpack (and potentially browserify) to work without additional configuration.
- ...

Cons:
- Additional testing time (due to one more set of files to run functional tests against).
- ...