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Pull #585

travis-ci

Lock down NPM modules

* Add publishable npm-shrinkwrap.json, which is repurposed from package-lock.json.
* Not lock down the dependent on-core, so don't add commit hash or version to on-core.
  The benefits:
    * Don't need to update npm-shrinkwrap.json every time when on-core has a new commit.
    * Ease the dependent PRs merging.
* Install npm@5.6.0 in travis-ci which is the same as concourse-ci.

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