This reverts commit 04e0ca1f.

Refactors credentials/token handling to rely less on env variables and instead use an endpoints middleware for credentials handling.

First step towards #2105

Closes #1764 

Closes #1829

Validates that each packageRule must contain at least one selector. Resolves the rule first to allow for presets.

Closes #1345, Closes #1693

Enables a “banner” at the top of PRs. Must be set inside a config.js to work.

Adds a config option to bot administrators called `exposeEnv`, for cases where repositories are trusted. If set to true, the bot's full `process.env` can be used for `.npmrc` variable substitution and is passed to child processes when generating lock files. Disabled by default, including in the App.

This PR adds support for Microsoft's [Visual Studio Team Services](https://www.visualstudio.com/team-services/) platform (in addition to existing GitHub and GitLab support). 

Closes #571 

* install npm from npm

* use embedded npm and remove versions checking

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

This feature now allows a custom schedule to be defined for lock file maintenance. It is now enabled by default but runs only before 5m on Sundays. Closes #399

BREAKING CHANGE: lock file maintenance is enabled by default.
Rules will apply to both yarn and npm (npm is yet to be implemented however). Existing mainainYarn* variables are removed and replaced by new lockFileMaintenance object.

* Move yarn and npm helpers into branch worker

* Fix name

* Move package-json helper

* Update name

* Move changelog

* Move github-app

* Remove unused platform

* Move logger

* Fix lint

Closes #375 

* Detect versions at startup

* Add meaningful error messages when problems with npm or yarn

* Test helpers

* Test global versions

* Add debug messages to API

* Fix rebase logic

* Fix tests

* Simplify logic

* Update branch.spec.js

* Move package-file worker

* rename to renovatePackageFile

* Move packageJson

* Add getDepTypeConfig

* Add

* Revert "Add"

This reverts commit d034e6149af90caf57de3f1b5069674fd8537bd3.

* Refactor versions

* rename findPackageFileUpgrades

* rename versions

* packageWorker

* Refactor promises

* move snapshots

* Rename

* Refactor versions

* Refactor

* Finish package worker

* Major refactor

* Remove worker tests

* package/versions

* Finish packageWorker tests

* package-json test

* Finish dep-type tests

* Add back package-json helper test

* Refactor package-file

* Add back branch and pr

* Add back remaining worker tests

* update tests

* remove snapshot

* Fix dep-type coverage

* Remove old tests

* Coverage

* Add subdirectory

* Move apis tests

* Move onboarding

* Move more apis functions

* Move upgrades

* Refactor index

* Renames

* Set levels in definitions

* Rename global worker

* getRepoConfig use options levels

* Refactor packageFileConfig

* Add onboarding configuration

* Move to subdir

* Downgrade eslint to 3

* Refactor api and config usage

* Refactor mergeRenovateJson

* Test mergeRenovateJson

* getOnboardingStatus tests

* Refactor repository structure

* Refactor config.logger

* Revert "Refactor config.logger"

This reverts commit 6d7f81af6ee284d01aab811dab7eb05c2274edf3.

* Refactor repository logging

* Refactor try/catch

* Refactor platform and onboarding

* Refactor setNpmrc

* Fix github logger

* npm api use config.logger

* Refactor repo worker logger

* Refactor repo worker

* Refactor branched upgrades

* Repository refactoring

* Move some debug logging to trace

* Deprecate fileName

* Refactor upgrades

* Refactor repository logs

* More repository log refactoring

* Refactor repository location

* Revert "Refactor repository location"

This reverts commit faecbf29516737a2752de54103c0228b9112a51c.

* Fix tests

* mergeRenovateJson

* Recombine repository worker

* Add initApis tests

* add detectPackageFiles tests

* Add determineRepoUpgrades tests

* start groupUpgradesByBranch tests

* add test

* add test

* Finish groupUpgradesByBranch coverage

* Test updateBranchesSequentially

* Finish repo coverage

* Finish branch worker coverage

* Finish workers coverage

* Fix isPin

* Complete workers coverage

* Finish helpers coverage

* Add gitlab api tests

* getBranchStatus tests

* test createPr

* start getPr testing

* getPr

* update and merge PR tests

* getFile

* getFileContent tests

* getFileJson tests

* createFile

* updateFile

* createBranch

* commitFilesToBranch

* update yarn

* Update yarn

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