Bugfix.

Merge pull request w7corp#166 from xiaohome/master

微信小店

Merge branch 'master' of github.com:overtrue/wechat

Merge pull request w7corp#161 from overtrue/2.1

�红包类更新

For php 5.3

Bugfix

Media extension guess fail. Fixes w7corp#157

Has检查改为直接判断内容

Merge pull request w7corp#154 from Liv1020/2.1

修复使用!=，来判断0 != null 的时候的一个bug

Merge pull request w7corp#151 from tianyong90/2.1

调整多客服类删除客服方法