Refactor schedules to use simpler

* [X] Refactor holidays to use simpler.
* [X] Refactor street sweeping to use simpler.
* [X] Refactor schedules to use simpler.
* [ ] Add tests for street sweeping, holidays, and schedules tasks (Done but commented out, see #27)

Yeah, it was a weird test first thing. Should've removed it here and in the street sweeping task.