fix(server): make user tests run more consistently

require app so user tests can run independently of other tests

use `beforeEach` to remove users instead of `before` so tests run more consistently

closes #346

app/templates/server/api/user(auth)/user.model.spec.js

@@ -1,19 +1,18 @@
 'use strict';
 
 var should = require('should');
+var app = require('../../app');
 var User = require('./user.model');
 
-var user;
+var user = new User({
+  provider: 'local',
+  name: 'Fake User',
+  email: '[email protected]',
+  password: 'password'
+});
 
 describe('User Model', function() {
-  before(function(done) {
-    user = new User({
-      provider: 'local',
-      name: 'Fake User',
-      email: '[email protected]',
-      password: 'password'
-    });
-
+  beforeEach(function(done) {
     // Clear users before testing
     User.remove().exec().then(function() {
       done();