* qrencode不改编不过，尼玛这。。。是要自己定一些宏？
+ learn/test_qrcode
* 添加基于qrencode的二维码生成模块
* 更正错别字
* 修正注释
* 修改时间计算一个bug ==写成=
Merge branch 'master' of https://github.com/zpublic/zpublic
* fix 计算TimeInterval bug
+ import udt
Merge branch 'master' of https://github.com/zpublic/zpublic
Merge branch 'master' of https://github.com/zpublic/zpublic
* 修正逻辑bug
Merge branch 'master' of https://github.com/zpublic/zpublic
* 增加让learn编不过的c++11代码。。。=_=
Merge branch 'master' of https://github.com/zpublic/zpublic
* 调整代码逻辑qrcode
Merge branch 'master' of https://github.com/zpublic/zpublic
* 升级全线工程到vs2013（拥抱c++11）
Merge branch 'master' of https://github.com/zpublic/zpublic
+ cpp11 learn plan