invenio-recreate-demo-site: fix default language choice

* Changes CFG_INVENIO_SITE_LANGS default value to "all" so that default
  language choice would be Invenio-version-independent.  Otherwise
  certain languages that are only available on higher versions (say
  "master") would lead to tracebacks on lower versions (say
  "maint-1.1").

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
prerequisites: fix for Ubuntu 14.04 LTS

* switching from openoffice.org to libreoffice

* disabling 000-default as well as default-ssl using wildcard.

* renaming vhost configuration to .conf otherwise a2ensite doesn't see
  them.

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>
invenio-kickstart: virtualenv fixes

* Fixes some paths.

* Adds don't remove the pip on Debian.

* Fixes the pip.

* Silents the a2ensite actions for repeated runs.

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>