doc: Add "linux", "js" GOOS-GOARCH env pair.

Resolves #342.

There is a Go compiler (named GopherJS) that targets environments where only JavaScript can run. Its GOARCH value is "js". Adding a "linux", "js" GOOS-GOARCH env pair allows gddo to display Go packages that are targeting js environments only.

See https://github.com/golang/gddo/issues/342#issuecomment-149797379 for full motivation and additional details, examples of such packages that currently exist.
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