2013-07-03 issue [58](https://github.com/qiniu/python-sdk/pull/58)
- 实现最新版的上传API,<http://docs.qiniu.com/api/put.html>
- io.PutExtra更新,废弃callback_params,bucket,和custom_meta,新增params
- 修复[16](https://github.com/qiniu/python-sdk/issues/16)
- put接口可以传入类文件对象(file-like object)
- 修复[52](https://github.com/qiniu/python-sdk/issues/52)