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

Closes #226 

depTypes configuration is now refactored from being an array of strings/objects to having each type of dep (`dependencies`, `devDependencies`, `optionalDependencies`, `peerDependencies`) be a first class object in the namespace. The "old" way of configuring is still supported but is transformed using a migrateConfig script. Later, PRs will be raised to impacted repositories to suggest the new config.

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.

This removes the need to JSON.stringify() objects in logs. Default bunyan fields plus our custom meta fields are stripped out, and everything else is stringified in the details field.

Closes #498

Onboarding PRs now include much less default configuration options than before.

Closes #484

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.

Renovate will now "maintain" npm@5's `package-lock.json` files on the same schedule as existing `yarn.lock` maintenance.

Closes #470

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 branchName to mergeRenovateJson

* Split onboarding into branch and PR

* Update onboarding description

* remove snapshot

* Update tests

* Update onboarding text

* Add subdirectory

* Move apis tests

* Move onboarding

* Move more apis functions

* Move upgrades

* Refactor index

* Renames