Squashed 'SinaStorageSDK/' changes from a2b18a8..fcb19b1

fcb19b1 update readme

git-subtree-dir: SinaStorageSDK
git-subtree-split: fcb19b1c428218e56925b9567c066b70729dbceb
Merge commit '18e970f575db1fa3ec9ed4b8cdfd50ecfa334a1c'