If MaxRequestWorkers is greater than 256 than you also need to set the
ServerLimit value which is defaulted to 256 but has a 20000 hard maximum

* Adding exclude_listen_directive option

* Updating Debian config

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

Sometimes it's necessary optimization in nginx+apache2 environment

Added example shows 503 code instead of "It works!" page.

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