Merge pull request #203 from phunehehe/nginx

declare repo version + `raise NotImplemented` for unsupported platforms
use release branch instead of tag
better defaults, create missing directory
dkim for centos
centos uses opendkim user which is arguably better
Merge pull request #206 from phunehehe/dkim

dkim for centos
Merge pull request #205 from phunehehe/icinga

better defaults, create missing directory
give sftp users proper homes
Merge pull request #207 from phunehehe/sftp

give sftp users proper homes
Merge pull request #204 from phunehehe/roundcube

use release branch instead of tag
include apc when needed
build packages using collectd.spec
add recipe for graph
add default config file
enable statsd
use pid file from environment variable
replace transitional package libmysql-ruby with the real one ruby-dbd-mysql
remove the unneccesary LockFile option (causing compatibility problem)
ubuntu 14.04 ships with apache 2.4 which does not use authz_default
remove deprecated directives