fix for Ubuntu 14.04 LTS and Travis

* switches from openoffice.org to libreoffice
* disables 000-default as well as default-ssl using wildcard.
* renames vhost configuration to .conf otherwise a2ensite doesn't see them.
* keeps pip, no downgrading
* fix some path (related to travis)
Works on precise64 with the above change, so I'll amend your PR in this respect and I'll merge.  Thanks!