Squashed 'SinaStorageSDK/' changes from fcb19b1..e4dfcd6

e4dfcd6 添加上传文件方法，自定义请求头

git-subtree-dir: SinaStorageSDK
git-subtree-split: e4dfcd668dd47096b10a1f3a36ed69b11a6135c8
Merge commit '8e231e58ea330175798a27d9f0b417bef4c0435e'

Conflicts:
	SinaStorageSDK/src/com/sample/Sample.java