一个拍照和图库案例，使用EasyPermission权限库解决6.0权限问题，解决7.0 FileProvider问题，华为手机获取不到图库相片问题等等
项目包含的功能：
调用系统相机拍照
图库选取图片
处理华为图库获取不到图片问题
处理部分手机拍照后，图片旋转角度问题
RxJava加载图片，向上取整计算合适比例。
EasyPermission库处理去读写权限( 适配Android6.0系统及其以上)
FileProvider访问文件(适配Android7.0系统及其以上)
跳转其他程序，Activity被系统因内存不足回收，处理数据保存问题。
更多详情，请阅读Android 拍照和图库功能（适配Android 6.0和7.0系统和华为机型问题）
根据以上功能模块封装一个类库，详情尽在PhotoCrop库
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