Closes #317 

* Install traverse

* Scrub api and logger in stringify config

* Use stringifyConfig

* Ignore logs

* Add meta to CLI logs

* Refactor repo structure

* rename repoWorker

* renamed worker

* Refactor logger location

* Refactor main worker

* Refactor getRepoConfig

* Refactor err

* Refactor repo logger

* Add config serializer and logger

* Refactor redact

* Remove stringifyConfig

* Refactor onboarding

* Set packageFile logger

* Refactor package file logic

* branch and pr logging

* Improve log context

* Fix tests part 1

* more test fixes

* Fix github init

* All tests passing

* Rename cli helper

* Refactor logger

* Add logger tests

* Add config serializer tests

* Add configParser tests

* Fix package file tests

* Expand package-file tests

* Use defaultConfig

* Add package-file tests

* Refactor

* Finish package-file tests

All promise syntax has been replaced with async/await.
`renovate` is now transpiled with `babel` to a `dist/` folder, which is the target of `main` and `start` in `package.json` now.
`renovate` can be run in `node.js` v7 without transpilation using `npm run start-raw`

Closes #77 

Helps #3