Fix synchronize with OneDrive and path

I've fixed the path (yet again) in `setup.sh` to `cd` to `src` before we execute `skydrive-d`. The reason behind this is that `skydrive-d` calls for `python ./synchronize.py` which does not work when we are not in `src`. As said in the one commit message, this seems like a temporary fix.

`synchronize.py` was also fixed. Before commit 359b785, `synchronize.py` would output `NameError: name 'DirectoryEntry' is not defined` which is the reasoning behind the commit.