Add rewrites to vhost directories

(#MODULES-111) Duplicate rewrites parameter from apache::vhost
as an array of hashes placed in the directories parameter
to enable use of mod_rewrite directives in vhost directories.

Add documentation to Parameter directories for apache::vhost for
rewrites array.

Add tests to vhost directory rewrites

Add spec/acceptance and spec/defines tests for vhost entries of
directory with rewrites.

These tests are based on WP permalinks.