## Changes
This change adds support for job parameters. If job parameters are
specified for a job that doesn't define job parameters it returns an
error. Conversely, if task parameters are specified for a job that
defines job parameters, it also returns an error.
This change moves the options structs and their functions to separate
files and backfills test coverage for them.
Job parameters can now be specified with `--params foo=bar,bar=qux`.
## Tests
Unit tests and manual integration testing.
Pieter Noordhuis