Squashed 'SinaStorageSDK/' changes from ef392fa..2687097

REVERT: ef392fa 修复网络连接重试bug
REVERT: 6c5a4f0 init
REVERT: 05081b5 init

git-subtree-dir: SinaStorageSDK
git-subtree-split: 26870973623507c00bbb26417415e1b7c5c8c92f
Merge commit '917242ac5bd27075cb5342b648c4fd6e7fc5c906'

merge from SinaStorage-SDK-Java