Fixes #31 - Add settings config from upstream

Incorporates custom settings config from upstream (the architecture, but not the content from https://github.com/codeforamerica/ohana-web-search/pull/444)
The example settings file should not have SMC-specific email addresses. It should be as generic as possible. If someone wanted to submit a PR that introduced a new setting or made other settings-related changes, this is the file they would send back to ohana-web-search, so it should not contain any SMC customizations.