Const, service, and model updates

- Updated enum values to be uppercase
- Updated services to expose service models
- Updated models to only export the mongoose model
- Moved all mongoose static methods over to new services
- Updated tests to refelct new setup

BREAKING

- Status that were uppercased (caps) have caused issues with the
  admin pages

init.js

@@ -1,7 +1,14 @@
-const Setting = require('./models/setting');
+const SettingsService = require('./services/settings');
 
 module.exports = () => Promise.all([
 
   // Upsert the settings object.
-  Setting.init({id: '1', moderation: 'pre', wordlist: {banned: [], suspect: []}})
+  SettingsService.init({
+    id: '1',
+    moderation: 'pre',
+    wordlist: {
+      banned: [],
+      suspect: []
+    }
+  })
 ]);