sds / overcommit / 1583

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travis-ci

Add YarnCheck pre-commit hook

Add a hook that checks that a [`yarn.lock`](https://yarnpkg.com)
matches the given `package.json`. This is very similar, and mostly
copied from, the existing `BundleCheck` pre-commit hook.

The primary difference is that `yarn check`'s output needs a bit
more massaging. Since it reports a number of issues that are
unrelated, or outside the developer's control, check for certain
error statements that do indicate the lockfile is out of date.

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