搜索来源子github，主要是进行一些整理 ，方便后期使用

参考项目

https://github.com/golang/image 
https://github.com/fogleman/primitive 
https://github.com/disintegration/gift 
https://github.com/disintegration/imaging 
https://github.com/pierrre/imageserver 
https://github.com/willnorris/imageproxy 
https://github.com/thoas/picfit 
https://github.com/nfnt/resize