I am no longer using GNOME 3 so I have stopped developing this extension for now. However, a fellow coder, Christian Schramm has decided to take up where I left so I recommend going to his repository for more updates and instructions. Thanks.
GNOME Shell Edge-Flipping is a GNOME Shell extension that provides reactive screen edges to switch between different workspaces, similar to what is provided by Brightside, by some plugin in Compiz or natively in other Desktop Environments like Xfce.
Visit the project's website for more information.