Updates definitions for schedule and package rules to allow strings to be massaged to lists - instead of erroring.

Closes #662

Fixes #656 

Repository initialisation is refactored so that all package files and their content is retrieved up-front before an renovating begins. This allows us to know both how many package files as well as determine if there is renovate json in a package.json before triggering the onboarding PR.

Closes #634

Now no need to detect at onboarding time. Also suggests removing setting in migration if it is already the same value.

Closes #528

This PR adds detection and log warnings for the following config validation errors:
- Unknown config option (e.g misspelling of a valid config option)
- Config option is a wrong type (e.g. string instead of boolean)

It does *not* propagate this warning to the user (i.e. in onboarding or PRs) yet due to the high chance that we'll find a false negative. I will watch logs for a week or so and then once happy with results will activate user-visible warnings via #556.

Closes #548, Closes #555

If a `lerna.json` is present in the root of the repository, then Renovate will automatically ignore (i.e. not renovate) all package names found in the `packages/*` path. It does not require an explicit configuration to work.

Renovate will now ignore any package.json files found within node_modules folders, with the option to disable this functionality by setting config.ignoreNodeModules=false.

Closes #450

Errors in PRs are expanded to include:
- If renovate.json parsing fails
- If an empty or unparseable package.json was found

Closes #435 

* Add subdirectory

* Move apis tests

* Move onboarding

* Move more apis functions

* Move upgrades

* Refactor index

* Renames