This changes how group are configured to align with the new lock file configuration.

BREAKING CHANGE: old group* template options are no longer supported but can be migrated into group object

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.

No longer massages packageFile.fileName -> packageFile.packageFile

BREAKING CHANGE: “fileName” notation no longer supported

No longer supporting preformatted (markdown) changelog input for templates.

BREAKING CHANGE: Preformatted {{changeloge}} no longer supported in PR body template.
Generate changelog using handlebars as in the default templtaes.

This PR adds a scheduling feature, including timezone support.
It's described in detail in the FAQ, but the summary is:

*   Timezones can be defined so that schedules are written in timezone of target repository
*   Schedules can be written in "plain english"
*   Multiple schedules allowed
*   Schedules can be defined all the way down to package level

Closes #387

Defaults to disabled. Included in onboarding.

Closes #303 

* Reset version to 0.0.0-semantic-release
* Add semantic-release and condition-circle
* Add circleci deployment config

* 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

* Skip repositories with no package.json

Closes #376

* Fix await

* Refactor file file check

* Update tests

Fixes #371

* Add debug messages to API

* Fix rebase logic

* Fix tests

* Simplify logic

* Update branch.spec.js

Closes #333