added link to Pyhsical Pythin i2c article in "getting started with i2c"
Merge branch 'master' of https://github.com/quick2wire/quick2wire-python-api
Merge branch 'master' of https://github.com/quick2wire/quick2wire-python-api
Merge branch 'master' of https://github.com/quick2wire/quick2wire-python-api
fixed analogue-bar to turn leds off when interrupted