Publish Cobertura xml output as zip

Ship Corbertura assets as a zip for our partner

They are requiring a zip file instead of the xml directly. Ship it both
so that we still link the xml directly from README.

v0.14.1

releasing package adsys version 0.14.1

v0.14.0

releasing package adsys version 0.14.0

v0.13.3

releasing package adsys version 0.13.3

v0.13.2

releasing package adsys version 0.13.2

v0.13.1

releasing package adsys version 0.13.1

v0.13.0

releasing package adsys version 0.13.0

v0.12.0

releasing package adsys version 0.12.0

v0.11.0

Merge pull request #665 from ubuntu/v0.11.0-changelog

Update changelog for the upcoming release

v0.10.1

Merge pull request #617 from ubuntu/prep-0.10.1

Preparing changelog for 0.10.1 release