add bind user function

app/models/bind_user.rb

@@ -10,6 +10,7 @@ class BindUser < ActiveRecord::Base
       filters [:wx_uid,:user_no,:remark]
       field :id
       field :wx_uid
+      field :nickname
       field :user_no
       field :remark
       field :created_at

config/locales/models/bind_user.yml

@@ -4,7 +4,8 @@ zh-CN:
       bind_user: 老会员绑定记录
     attributes:
       bind_user:
-        wx_uid: 微信ID
+        wx_uid: 原微信ID
+        nickname: 昵称
         user_no: 会员编号
         remark: 备注
         created_at: 创建时间