support crc64 check and img attr set

[baiyubin]

添加如下功能：

1. CRC64校验。上传、追加、分片上传、下载支持CRC64校验，边上传/下载数据边计算CRC64。
2. 添加两个接口putBucketImageProcessConf、getBucketImageProcessConf，添加签名字段x-oss-process支持oss和img合并。
3. rtmp的id改成name。

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[rockuw]

1. 如果SDK发现client crc和server crc不相等，不会直接抛错吗？
   // SDK只返回client crc和server crc，不做处理。
2. 不要把多个功能(rtmp)的修改混到这个review中
   // 以后注意。