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)
On Debian, `mod_version` is often compiled statically into Apache, so even though `sudo a2enmod version` may fail, the `IfVersion` directive is available for use in configuration files.  Hence we are kind of `:)`, not `:(`.  Hence we may perhaps amend echoing `:(` to something neutral like `[WARNING] Ignoring 'a2enmod version' command; hoping IfVersion is built-in` or something of the kind.  

(Ideally we could analyse `apache2 -M` and friends to detect whether we need to call `a2enmod version`, but I think we don't have to go too crazy with this; just tuning down the message should be OK, I think.)