django中实现图片上传

参考资料：
http://hi.baidu.com/cly84920/item/4bb2ae57470582c49e26677d
http://www.sandzhang.com/blog/2010/04/24/django-admin-uploadload-image-file/
http://my.oschina.net/u/160375/blog/60228
http://blog.donews.com/limodou/archive/2006/03/23/783974.aspx
http://blog.sina.com.cn/s/blog_7ae1b8300100ucyn.html
http://plq168.blog.163.com/blog/static/53101462201093115050188/