Generate complete source maps (#6756)

The source maps generated previously were mapping the bundled files to
the post-Babel files - they weren't showing mapping to the source files
as written.

It looks like this was a result of `reactify` being used in addition to
babel - that transformation must have dropped the source maps.

`reactify` still needs to be listed as a dependency because it is
an unlisted requirement of the `boron` package, which we use. We don't
need to use it to create our bundles though, as Babel already performs
the transformations we need.

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