I'm trying to install a WeMo light switch in the place of an existing switch. I'm unsure which wire is neutral, or if I have one at all. Below is a photo of where I'm at currently. There are two switches in this one box, one of which is a fan and the other is a light. Both have only two wires coming out of them currently. There is a cap over a bundle of wires visible in the photo, but one of each of the wires from the switches is tied into this bundle. Is this the neutral wire or should I be looking for something else?