* add dependents service

* remove redundant timeout

* arrowParens: avoid
* remove trailingComma setting

This migrates the puppetforge-modules from legacy
services to the new service arch
There are also some changes to the puppetforge-users
badges, but its just moving code around

This will definitely save time, and ensure more uniformity.

It moves the `createServiceTester()` calls to a different place from where I'd like them, though I'm happy to have them checked by the linter.

Closes #2701

Fixes #2876 with @paulmelnikow's suggestion 

Moved imports of `ServiceTester` and `createServiceTester` to a separate file so that dev dependencies are not imported by service classes.

Continue to implement #2698:

- Add `core/base-service/index.js` (but hold off on moving the things it imports)
- Add shortcuts in `services/index.js` for Base*Service, errors, and deprecatedService. This file will be streamlined later to avoid cluttering it with rarely used bits.
- Apply consistent ordering of imports and use of `module.exports` in testers.
- Remove some renaming of imports.
- Remove obsolete tests here and there.

* Spiget Downloads badge

* Spiget Download Size badge

* Spiget Latest version badge

* Add a base class

* Spiget Rating / Stars badges

* Spiget versions badge

* remove useless regex escape

* use renderVersionBadge for rendering

* misc fixes

* use expectJSON when possible

* use the download count color formatter

* merge service classes

* add keywords

* Add tests for non-star ratings

* Add nock tests

* misc fixes

* chore: minor formatting update on spiget dl

This makes it a bit more consistent with the others.

* bStats badges

* Remove inline tutorial comments

* Split tests into seperate files

* use shorthand for tester instantiation

* use Joi.number() for validation

* Misc. fixes

* update to use native api