添加视频采样接口相关文档。
为 upload 接口添加 crc32 和 accept 参数。
同步更新文档。
Merge pull request #202 from forrest-mao/doc/developer

Doc/developer
Merge branch 'master' of github.com:qiniu/developer.qiniu.com
添加 detectMime 使用的默认值。
Merge pull request #203 from forrest-mao/doc/developer

状态码变更579 => 478
Merge pull request #204 from forrest-mao/doc/developer

修改478，添加579
Update form-upload.md
Merge branch 'master' of github.com:qiniu/developer.qiniu.com
Merge pull request #205 from forrest-mao/doc/developer

增加文字水印文档及sample
Merge pull request #206 from rwifeng/patch-20

Update form-upload.md
合并文档。
Merge pull request #207 from forrest-mao/doc/developer

增加mkzip fop操作
Merge branch 'master' of github.com:qiniu/developer.qiniu.com
Merge pull request #208 from BluntBlade/master

同步更新文档。
添加视频教程链接。
Merge pull request #209 from BluntBlade/master

添加视频教程链接。
Update mkblk.md
Merge pull request #211 from rwifeng/patch-21

Update mkblk.md