Accidentally already added config_path in the last commit, not
redoing it again.

Now using the `deep_merge()` macro so we can move the
values which are identical on most distributions from
`map.jinja` to `defaults.yaml`.

Use alias states for managing mail aliases.

Minor formatting change

Use join() for iterable values in main.cf

Make postconf/newaliases respect file type

See github issue #50.

add support for postsrsd

See github issue #50.

According to postfix documentation [1], only some types of file require running
postmap, others must be left alone.

See github issue #50.

[1] http://www.postfix.org/postmap.1.html

Added config files for virtual users

Generic map handling

join is available in jinja-2.6, released in 2011.

Do not hardcode the key name, even if there is only two at the moment

Merge existing handling of postfix lookup table/map files into a single
template. Mappings are read from pillar in `postfix:mapping`.
Configuration is written to the file pointed to by the relevant
directive in `postfix:config`. A single target file is supported at the
moment. The file is postmap'ed if needed.

The pillar accepts a dict or an OrderedDict.

added watch statement to restart postfix

install postfix addons ( Debian Only)

  - mysql
  - pcre

added missing sls to README

manage relay_domains file from pillar

allow postfix/postgrey services to be enabled or disabled