added gamepad

Different names on Linux and Windows

saitek p580 rumble pad (name in windows device manager)
Colour Rumble Pad (name detected by mupen64 on windows 8)
Jess Technology Colour Rumble Pad (name on Linux lsusb)

Tested on windows 8 and Ubuntu 12.04
Merge pull request #1 from diekmann/patch-1

added gamepad