re-add changelog to zips as option

Many people are saying that the "Generating Changelog" take a while. This should get it to produce only with jenkins (once we add another parameter)

I will test with jenkins now with a no upload job.

Change-Id: I73336adc74c866077e4fae227df03abdc8b641ea
Signed-off-by: Matt Bloomfield <mbloomfield87@gmail.com>