Added Windows driver for virtual serial

Using the virtual serial port on Windows requires that the ```FlySight.inf``` driver be installed. To install the driver:

1. Plug in the FlySight.
2. Open the Windows Device Manager. The FlySight should appear under "Other Devices" with a warning symbol next to it:

![image](https://f.cloud.github.com/assets/145303/2495636/620c6446-b2fe-11e3-8e29-e33061a75710.png)

3. Right-click on the device and choose "Update Driver Software" from the menu.
4. Choose "Browse my computer for driver software".
5. Locate the folder containing ```FlySight.inf```, then click Next.
6. If prompted, choose "Install this driver software anyway":

![image](https://f.cloud.github.com/assets/145303/2495643/bd5e2802-b2fe-11e3-9af9-e035481e605d.png)

7. The FlySight should now appear under "Ports":

![image](https://f.cloud.github.com/assets/145303/2495646/d9a8867e-b2fe-11e3-82d6-3228ed4801ce.png)