ignore .git*
+ show files/dirs count in time
...
fix bug: target_files_size is zero bit
+ add download modified the same name files
+ Show Speed and Left Time
add server requests range (让服务器支持断点续传Range)
server_python2.py : Content-Length 返回的是文件的总长度而不是所传长度
download.py download_log func 支持断点续传功能
If server support Accept-Range, then use Accept-Range Func; If not, use not support Accept-Range Func
Ctrl+C Stop Client Program
.....
+ download.py : new Common Download Class
Download Class Maybe OK
+ Download Class OK!!
Default ID 0
little bug
+ if *.tmp > 100% delete tmpfile, redownload
server_python2.py support Accept-Range
+ 如果下载文件大小为0, 即self.__content_length=0 也要下载