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