Squashed 'SinaStorageSDK/' changes from 2687097..a2b18a8

a2b18a8 AccessKeyIdGrantee 改名为 UserIdGrantee
ef392fa 修复网络连接重试bug
6c5a4f0 init
05081b5 init

git-subtree-dir: SinaStorageSDK
git-subtree-split: a2b18a8ae083611c7d12791c0037f9c17209ab45
Merge commit '7c7da08272605ef1bb05ace27d8c1fa1a0275917'

update from SinaStorage-Sdk-Java