增加用户密码修改成功的API测试，以及增加用户邮箱字段并做了相应的API测试，目前的account/view.py测试覆盖率为100%

account/migrations/0003_user_email.py

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('account', '0002_auto_20150731_2310'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='user',
+            name='email',
+            field=models.EmailField(max_length=254, null=True, blank=True),
+        ),
+    ]