revert(api): decouple api from curriculum

This reverts commit c077ffe4b9
via PR #40703

api-server/server/models/auth-token.js

@@ -0,0 +1,15 @@
+import { Observable } from 'rx';
+
+export default function(AuthToken) {
+  AuthToken.on('dataSourceAttached', () => {
+    AuthToken.findOne$ = Observable.fromNodeCallback(
+      AuthToken.findOne.bind(AuthToken)
+    );
+    AuthToken.prototype.validate$ = Observable.fromNodeCallback(
+      AuthToken.prototype.validate
+    );
+    AuthToken.prototype.destroy$ = Observable.fromNodeCallback(
+      AuthToken.prototype.destroy
+    );
+  });
+}