Significant refactoring to the cookbook

* Remove CentOS, add Debian and Ubuntu 12.10 to .kitchen.yml
* Add package_recipe attribute to get package installation setup
* Remove redundant package and service resources
* Add backport_deb recipe to enable backport package via PPA
* Add build_aur recipe for ArchLinux support
* Move build directory to Chef's file_cache_path rather than /var/tmp
* Add afpd.conf template (Fixes #1)
* Update the README and metadata documentation
Merge branch 'refactoring'