Fixes for Ubuntu 14.04 LTS 'trusty'
* Postfix: Trusty comes with postgresql 9.3, not 9.1
* owncloud 6.0.1 is part of the distribution, doesn't require opensuse repository
* owncloud requires libapache2-mod-php5
* uses prosody repository that matches the ansible_distribution_release (trusty, wheezy, etc)
Ubuntu Trusty fix for Dovecot (postgresql 9.3 instead of 9.1)