Added WabbitEmu

Wabbitemu - An accurate emulator/debugger for the TI-81, TI-82, TI-83, TI-83+(SE), TI-84+(SE), TI-84+CSE, TI-85, and TI-86. ROM files obviously not included.

Note: The weird download link is where the actual file is hosted on Microsoft's CodePlex code hosting system. I tried using the direct link of the button (which works for most software), but it didn't work this time, so I had to dig around a bit.