Make option to select default upload folder in client.#147

For example:

• I’m using monosnap at home and at work, and now - all uploads are uploaded to the root folder. It would be awsome if i can chose for each client folder for upload. So i can crete folders ‘Home’, ‘Work’ and select them in the client. And when i upload file from client on my work machine - files uploaded in the ‘Work’ folder.