docs(semantic-release): implement an automated changelog

plus docs on contributing, testing

osmap: Raspbian used the Debian repo

ci(kitchen+travis): use `py2` instead of `py3` for `centos-7`

fix(windows): use correct `salt-minion` package name

* From `salt-winrepo-ng`:
  + https://github.com/saltstack/salt-winrepo-ng/blob/master/salt-minion-py2.sls
    - Package: `salt-minion`
  + https://github.com/saltstack/salt-winrepo-ng/blob/master/salt-minion-py3.sls
    - Package: `salt-minion-py3`
* Close #411

* Prepare for selecting correct version of Windows `salt-minion` pkg

Fix regression #403

This reverts commit 2a0f4617db.

* Close #403

Update the testing matrix (5 distros, 2 python versions, 3 salt versions)

To match the one used by the bootstrapper. Otherwhise, we end up with two repos configured

Use py3 for latest salt version
Use Python 2 on old distros
Update Gemfile
Updated centos-6 run_command, as it does not use systemd
Added tests to verify correct package versions for all cases tested

add autogenerated AUTHORS.md

Reformat `formulas.sls` Jinja to make it easier to work with

Make pkgrepo work for Debian derivatives without their own repos

e.g. TurnKey Linux amongst others

Fix `repo.saltstack.com` URLs for Python 3 packages (#364)

Fix `salt:lookup` regression

Simplify map.jinja revert deep_merge solution from #193

Fix `repo.saltstack.com` URLs for pinned minor release (#364)

* All minor releases appear in an `archive` sub-directory.
* Resolves main bug in GitHub issue #364.
* Simplification of original GitHub PR #365 by @ralucasg.

Add missing GitPython-package for Arch

add initial travis integration

add travis button to README

shutoff debug output from unless

Add support for file external_auth special directives

Fix support for extra config values as mappings

Move some defaults from pillar.example to defaults

Support fileserver_list_cache_time in master configuration

Stop noise from 'test -e' check'