* Add MacOS support; fix Issue #352

* On MacOS, only attempt download if condition

Add if salt_settings.install_packages to requisites for an attempt to download the minion package on MacOS

* Update example pillar for MacOS support

Describe how to use MacOS specific options

* Add MacOS notes

* Update README.rst

* Update README.rst

salt.gitfs.gitpython.install_from_source == False on RedHat
Not sure about other O/S'es as to what default value should be

On SmartOS the salt-api daemon is started by the salt:api service.

they get overwritten from defaults.yaml if not specified

add missing comas

SaltStack provides "versioned" repositories, this commit add a way
to set which release of salt to use.
It adds a pillar "salt:release" which can be set to a specific release
(ex: 2016.11). This release is then used to configure properly the
repositories URLs for Debian/Ubuntu/RedHat.
The default behavior is to point to 'latest', retaining the previous
behavior if the "salt:release" pillar is not set.

Checks for 'dict' in `x.__class__.__name__` b/c
neither `type()` nor `isinstance()` is available.

Rasbian reports back the following grain values:

local:
    ----------
    os:
        Raspbian
    os_family:
        Debian
    osarch:
        armhf
    osmajorrelease:
        8
    osrelease:
        8.0

Ubuntu reports back the following grain values:

local:
    ----------
    os:
        Ubuntu
    os_family:
        Debian
    osarch:
        amd64
    osmajorrelease:
        14
    osrelease:
        14.04

For Raspbian the osarch needed to be changed from other Debain os_family
distributions.
For Ubuntu the osrelease value is needed instead of osmajorrelease as other
Debian os_family distributions.

Part of #180

repo.saltstack.com handles all currently supported Debian releases as well
as all supported Ubuntu releases so this change should be fine.

Part of #180.

Without this change, importing map.jinja in config files (as opposed to
SLS files) causes a rendering error because `slspath` isn't defined.
The `salt_settings.key_url` variable gets used only in
`salt/pkgrepo/debian/init.sls`.

This adds some minimal support for Windows minions.

On FreeBSD salt-ssh gets bundled into a single package with the other
SaltStack components (minion, master, etc.).

This reverts commit b03831c0b0.

This change tweaks the GitPython package installation state to support
alternate package names (on FreeBSD, it's called "py27-GitPython").
Also, on FreeBSD salt-ssh is included in the "py27-salt" package by
default, requiring an update to `distro_map`.

* Install pygit from package
* Add Official Salt ZeroMQ 4 COPR repository

Note that Salt itself is assumed to already to be available to the system via yum, via EPEL for example

Using a variable named salt is a bad idea when salt already has a variable
named salt.

updated the map style without the base='default' parameter

Added map.jinja solution more in line with other formulas,
This also improves issue #30

and pull request #30