针对微信平台新增的事件类型，优化xml解析方法，深度解析xml
add test case
发现xml文档中有PicList字段，把相同子标签解析到一个数组
Bump 0.8.13
Merge branch 'master' of https://github.com/node-webot/wechat
fix_issue_#121
Merge pull request #122 from ifeiteng/fix_issue_#121

fix_issue_#121
Merge branch 'master' of github.com:node-webot/wechat
Bump 0.8.14
Merge branch 'master' of https://github.com/node-webot/wechat
fix doc