since rails4 remore xml_parse, add post_xml to get post xml

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Merge pull request #8 from sandect/master

since rails4 remore xml_parse, add post_xml to get post xml
Update responder.rb

修复菜单的点击事件，with可直接使用，event_key 值
增加bin/wechat引用
require fix
复制方法
Merge branch 'master' of github.com:qinmingyuan/wechat-rails