objc sdk update
objc doc
add unit test url
Merge pull request #213 from longbai/new-ios

objc sdk update
Merge pull request #214 from BluntBlade/master

同步更新文档。
format
pods format
Merge pull request #215 from longbai/new-ios

New ios format
add error
Merge pull request #216 from longbai/new-ios

add error
添加 frameNumber 图片信息项目。