fix(mocha): close all processes in mocha user.model test

using gulp, the `user.model` (mongoose) unit test will hang if there are
unfinished processes.  Closing express and mongoose allows mocha to
complete and gulp to continue running

Author: david-mohr

Diff for: app/templates/server/api/user(auth)/user.model.spec(mongooseModels).js

@@ -1,6 +1,7 @@
 'use strict';
 
 import app from '../..';
+import mongoose from 'mongoose';
 import User from './user.model';
 var user;
 var genUser = function() {
@@ -27,6 +28,11 @@ describe('User Model', function() {
     return User.removeAsync();
   });
 
+  after(function() {
+    app.angularFullstack.close();
+    mongoose.connection.close();
+  });
+
   it('should begin with no users', function() {
     return <%= expect() %>User.findAsync({})<%= to() %>
       .eventually.have.length(0);

Diff for: app/templates/server/app.js

@@ -34,7 +34,7 @@ require('./routes')(app);
 
 // Start server
 function startServer() {
-  server.listen(config.port, config.ip, function() {
+  app.angularFullstack = server.listen(config.port, config.ip, function() {
     console.log('Express server listening on %d, in %s mode', config.port, app.get('env'));
   });
 }