Added Rev2-mapping for GPIO-Pinheader 3 and 5

Source: http://elinux.org/RPi_Low-level_peripherals#General_Purpose_Input.2FOutput_.28GPIO.29
:Merge branch 'master' of git://github.com/pc-coholic/quick2wire-python-api into pc-coholic-master

Conflicts:
	quick2wire/gpio.py