Fixed tumblr url redirect

Tumblr ripper did not account for normal urls in the original_size field.  Tumblr will pass a redirect url rather then an image path if the image size is too big to host themselves... looks like anything >=800x600.
I check to see if the url has a valid image file extension, if it does not i treat it as a url.  
The url redirects to an AWS image.  So I ignore the content type and get the response url to download