packageRules selectors should only ever be inside a packageRule object, or at the top level of a preset. This feature enforces this rule with a validation check.

Closes #1773 

Closes #1734

Fixes #1632

Adds “renovate-config-validator” as a new bin entry to package.json. Can be run without arguments and will check renovate.json, .renovaterc, .renovaterc.json and package.json. Returns non-zero exit code with a description if there are errors.

Instead refer to website and source code.

Use `cacache` to persist changelog results between runs.

This commit drops support for nodejs 6 now that nodejs 8 has reached LTS. Renovate will now publish only the `lib/` directory and not `dist/`. Some babel is necessary to leave in-place because Jest otherwise crashes when encountering the spread operator.

BREAKING CHANGE: Node.js 6 is no longer supported

Renovate will now depend on yarn like any other dependency and call this version directly, instead of having an embedded version. This will allow us to "renovate" the yarn version we use too.

Renovate now uses an embedded yarn binary. This way, the version of yarn used can be known + there is no requirement for Renovate admins to install yarn separately.

This pinned yarn version prevents newer or older versions of yarn from installing renovate.

Closes #427

* CircleCI yarn version

* Create circle.yml

* Create circle.yml

* Add yarn install script

* refactor circle.yml

* fix install detection

* set yarn path

* Update dependency prettier to version 1.3.1

* Run eslint-fix

* Update dependency prettier to version 1.3.0

* Run eslint-fix

Now generates CLI, env and docs
Makes config more testable