This fixes the following error when Jinja tries to process
`mpm_prefork.conf.jinja` or `00-mpm.conf.jinja`, when it processes the
`max_request_workers` comparison:

```
Unable to manage file: Jinja error: '>=' not supported between instances of 'str' and 'int'
[...]
<IfModule mpm_prefork_module>
  StartServers {{ mpm_param['start_servers'] | d('5') }}
  MaxRequestWorkers {{ mpm_param['max_request_workers'] | d('150') }}
{%- if mpm_param['max_request_workers'] | d('150') >= 256 %}    <======================
  ServerLimit {{ mpm_param['max_request_workers'] | d('150') }}
{%- endif %}
  MinSpareServers {{ mpm_param['min_spare_servers'] | d('5') }}
  MaxSpareServers {{ mpm_param['max_spare_servers'] | d('10') }}
  MaxConnectionsPerChild {{ mpm_param['max_connections_per_child'] | d('0') }}
```

Add filters that convert the values to an int first.

```bash
Examining apache/files/RedHat/modsecurity.conf.jinja of type state
[201] Trailing whitespace
apache/files/RedHat/modsecurity.conf.jinja:26
```

The source template was missing for RH based systems, only the Debian
file was packaged.

Fix this.

The formula currently adds a Listen directive for the port '*' if
any configured vhost is configured to listen on :* which does not
work and instead prevents apache from starting.

It is possible to prevent this by setting the
exclude_listen_directive pillar to True but this is a manual
workaround.

Instead, this commit excludes :* Listeners automatically.

The docroot fix from PR#240 worked fine for default servers.
But as soon as one uses vhosts this broke as the vhosts were
created under the docroot in /var/www/html rather than the better
/var/www.

Fix this by differentiating between docroot and wwwdir.
Further allow to override both in Red Hat-style configs.
The override allows to reuse this formula for the softwarecollections
rpms.

* Adding exclude_listen_directive option

* Updating Debian config

* RedHat: Made AddDefaultCharset Directive configurable

* Added description of apache:lookup:default_charset to pillar.example, sane default equals former hardcoded UTF-8

Add gitignore, kitchen-ci files
Add some tests and documentation

- Added more modules and configuration options
 - Renamed sls files to reflect what they do.
 - added mpm options for Debian