Update init.php for email data provider
Fix 'default_providers' config in testing environment

Missing s
Allow access to data-provider config via API
Get data provider status from config API and show in listing

Load data-provider config group, copy status to 'enabled' attribute on
data-provider models. Use this to update the views.
Clean up DataProviderModel.js and set default 'enabled' to false
Save provider status to config api when enabled/disabled in listing
Fix link to data provider config
Load data-provider config values, wire up config form to save them
Allow data-provider-* configs in API - @todo find a way to avoid hardcoding