版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/angular-img-cropper/1.1.0/angular-img-cropper.js
- https://cdn.bootcdn.net/ajax/libs/angular-img-cropper/1.1.0/angular-img-cropper.min.js
Client side image cropper directive for AngularJS (rectangular area, aspect ratio, multi-touch)