- Add test suite for `get-config`
- Fix `get-config` to handle merging nested `gpg` property correctly

Update existing test suites to handle changes made in modules to
retrieve and use YAML config.

- Add test cases to exercise the web flow ignore logic
- Fix implementation to return `success` even when ignoring web-flow
  failures

Add a few rudimentary tests for web flow ignore logic in
`reduce-statuses`.

- Fix `create-commit` test helper to put the `login` property correctly
  under the `committer` property, not under `commit`
- Update `get-commits` module to return the entire entry object for each
  commit, not just the `commit` property
- Update unit tests to reflect that change