Refactor and advancements

- Drops mailController, centralized in UserController
- Adds views folder for change_password
- Improves PromiseRouter to support text results
- Improves PromiseRouter to support empty responses for redirects
- Adds options to AdaptableController
- UsersController gracefully fails when no adapter is set
- Refactors GlobalConfig into same style for Routers

src/Routers/GlobalConfigRouter.js

@@ -0,0 +1,48 @@
+// global_config.js
+
+var Parse = require('parse/node').Parse;
+
+import PromiseRouter from '../PromiseRouter';
+
+export class GlobalConfigRouter extends PromiseRouter {
+  getGlobalConfig(req) {
+    return req.config.database.rawCollection('_GlobalConfig')
+      .then(coll => coll.findOne({'_id': 1}))
+      .then(globalConfig => ({response: { params: globalConfig.params }}))
+      .catch(() => ({
+        status: 404,
+        response: {
+          code: Parse.Error.INVALID_KEY_NAME,
+          error: 'config does not exist',
+        }
+      }));
+  }
+  updateGlobalConfig(req) {
+    if (!req.auth.isMaster) {
+      return Promise.resolve({
+        status: 401,
+        response: {error: 'unauthorized'},
+      });
+    }
+
+    return req.config.database.rawCollection('_GlobalConfig')
+      .then(coll => coll.findOneAndUpdate({ _id: 1 }, { $set: req.body }))
+      .then(response => {
+        return { response: { result: true } }
+      })
+      .catch(() => ({
+        status: 404,
+        response: {
+          code: Parse.Error.INVALID_KEY_NAME,
+          error: 'config cannot be updated',
+        }
+     }));
+  }
+  
+  mountRoutes() {
+    this.route('GET', '/config', req => { return this.getGlobalConfig(req) });
+    this.route('PUT', '/config', req => { return this.updateGlobalConfig(req) });
+  }
+}
+
+export default GlobalConfigRouter;