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

```yaml
DatabaseAdaptor: ooiservices.adaptor.sqlite:SQLiteAdaptor
```

```python
from ooiservices.config import DatabaseAdaptor
import imp
modulename, classname = DatabaseAdaptor.split(':')
module = imp.load(modulename)
adaptor = getattr(module, classname, None)
if adaptor is None:
  raise Exception("No adaptor for %s" % DatabaseAdaptor)
```