[PATCH 1/2] doc: Add CHANGELOG and UPGRADING docs

[Finucane, Stephen]

> The CHANGELOG document should describe the high level changes of the
> project. This will provide a human-readable way for people to evaluate
> the changes in each release. This file is based on the templates and
> general changelog "ethos" provided by 'Keep a CHANGELOG':
> 
>     http://keepachangelog.com/
> 
> The UPGRADING document provide instruction for system admininstrators
> managing patchwork deployments. At the moment, this document is a
> rename and minor reformatting of the existing 'docs/NEWS' document, but
> going forward documentation will be added for each new release.
> 
> Signed-off-by: Stephen Finucane <stephen.finucane at intel.com>

Merged (and tags added).

Stephen