Squashed 'SinaStorageSDK/' content from commit 721d2a9

git-subtree-dir: SinaStorageSDK
git-subtree-split: 721d2a921f0a2b49c695e1c91d32c47919eafb51
Merge commit '83cd2a8424da96b44a65c2d927938ef078fb26d4' as 'SinaStorageSDK'