include apc when needed
use built-in opcache for php5.5 on ubuntu 14.04
postgresql9.3 is default on ubuntu 14.04
Merge pull request #208 from phunehehe/roundcube

include apc when needed
Merge pull request #223 from nhannguyen/postgresql

postgresql9.3 is default on ubuntu 14.04
move recommended settings to default attributes
Merge pull request #222 from nhannguyen/php

use built-in opcache for php5.5 on ubuntu 14.04