This merges the `node-8` branch. The heavy lift was by @Daniel15 with refactoring from me and a patch by @RedSparr0w.
* New API for registering services (#963)
* Disable Node 6 tests on node-8 branch (#1423)
* BaseService: Factor out methods _regex and _namedParamsForMatch (#1425)
- Adjust test grouping
- Rename data -> queryParams, text -> message
* BaseService tests: Use Chai (#1450)
* BaseService: make serviceData and badgeData explicit and declarative (#1451)
* fix isValidStyle test (#1544)
* Run tests in Node 9, not Node 6 (#1543)
