refs https://github.com/TryGhost/Team/issues/597
- To be able to transpile the library for different runtimes (make it polymorphic) had to get rid of dependencies that were not compatible with ES Modules
- By making errors an injectable constructor option it removes the depencency and allows to transpile the library for multiple targets
- The `errors` option is now a required parameter for `loadLimits` method. It errors if it's missing (error message copy inspired by content api error 69fcea0582/packages/content-api/lib/index.js (L21))
