Fixes

Hi,
Some fixes i had to apply for the whole thing to work:
You joined two absolute paths when building your destination paths. Pythons os.path.join function will always return the latter path in this case resulting in all subdirectories to go straight to the root of your drive.
The other bug was simply adding two strings together instead of properly joining them as path components.

I really dislike the use of wget in this, because no matter what you do it will always put a temp file into your cwd.
If shitcasa wasn't on its way out, i'd be happy to convert this to streaming requests for the donwloads.