Merge pull request #5 from why404/master

updated sdk download link
add uptoken-upload and mkbucket
add docs for mkbucket and uptoken-upload; do little adjustment
merge from qiniu/master
Merge pull request #6 from shijiayun/master

添加mkbucket和uptoken的上传及相应的文档
add project file
delete putAuth doc
delete test key
delete suo file
add imageOp
add save-as
rename demo->Demo
tmp delete demo for rename
add Demo replace demo
Merge pull request #7 from shijiayun/master

增加 Visual C# 的工程文件，方便用户使用；去掉 PutAuth 的文档，修改了 DOMAIN。
save
save
resumable put ok
use streamutil replace CopyTo
add downloadToken