stream wrapper for sae(sina app engine) storage
enable protocol:
- saes3://domain/path/to/file
- saes3gz://domain/path/to/file
supported method:
- fopen(with modes)/fclose/fread/fwrite
- flock(_sae_flock) #see code
- file_put_content(get)
- fstat & stat
- rename/unlink/mkdir
- [chunk mode file read & write]
- [identify file or folder or both]
- [auto gz compress/decompress]
SAE storage allows same name (both file & folder) at same time