chore: remove devDependencies from package.json published to npm

[pkozlowski-opensource]

This is a follow up PR related to #4454 - since we are dropping es6 output and all the convenience script to transpile e6->es5 we don't need devDependencies in the published npm package

[pkozlowski-opensource]

@alexeagle @IgorMinar could you please take a look?

[mary-poppins]

Merging PR #4502 on behalf of @IgorMinar to branch presubmit-IgorMinar-pr-4502.

[mary-poppins]

Merging PR #4502 on behalf of @IgorMinar to branch presubmit-IgorMinar-pr-4502.

[alexeagle]

This did not depend on my change, right? I haven't submitted yet because the checkCyclicalDependencies finds cycles in the commonjs dep graph...

[pkozlowski-opensource]

@alexeagle nope, this doesn't require your change. I've got few more cleanups in the pipe (ex.: removing dependency on gulp-traceur) for which I'm going to open PRs as soon as your patch lands.

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