Adds configuration management through YAML

Depends on https://github.com/asascience-open/ooi-ui-services/pull/23

- `ooiservices.config` is a dynamic module that is loaded from a package resource (`ooiservices/config/config.yml`)
- Configuration can be dynamically reloaded
- YAML is easier to read than `ini` in my opinion.
- Top level configurations become variables in the config module
The module is dynamically loaded on the first import and then explicitly after that if needed. I'm using `pkg_resources` so that configuration is tied directly to the `ooiservices.config` package and will make deploying and remote management easier.