Make sure that mixins are specific to each new app.

lib/application.js

@@ -17,7 +17,7 @@ module.exports = {
   init: function () {
     _.extend(this, {
       methods: ['find', 'get', 'create', 'update', 'patch', 'remove'],
-      mixins: mixins,
+      mixins: mixins(),
       services: {},
       providers: [],
       _setup: false

lib/mixins/index.js

@@ -1,6 +1,8 @@
 'use strict';
 
-module.exports = [
-  require('./promise'),
-  require('./event')
-];
+module.exports = function() {
+  return [
+    require('./promise'),
+    require('./event')
+  ];
+};

test/application.test.js

@@ -293,4 +293,14 @@ describe('Feathers application', function () {
       });
     });
   });
+
+  it('mixins are unique to one application', function() {
+    var app = feathers();
+    app.mixins.push(function() {});
+    assert.equal(app.mixins.length, 3);
+
+    var otherApp = feathers();
+    otherApp.mixins.push(function() {});
+    assert.equal(otherApp.mixins.length, 3);
+  });
 });