Squashed 'SinaStorageSDK/' changes from 123213e..c444045

c444045 update read me
a000538 修改接口域名为cn后缀
84e9a99 update read me
5a5924d update read me
9b69ba4 modify sample
0f10e78 update read me
c5ae877 rename Exception class name

git-subtree-dir: SinaStorageSDK
git-subtree-split: c444045aa94ef11a803c63caccc2c284b814c439
Merge commit 'd281fa4dfd7109c1d874570bff5bf9ec7df6d4af'