broken link and xdk not needed in python watering-system

[fromgilbert]

on https://github.com/intel-iot-devkit/how-to-code-samples/blob/master/watering-system/python/README.md#intel-iot-gateway-setup

why does it say you'd need the XDK? shouldn't need it, since this is python

Also, the link in that paragraph is broken:
https://software.intel.com/en-us/node/633284