invenio-kickstart: initial release

* Initial release of Invenio kickstarter, useful to bootstrap
  Invenio development environment with an Invenio demo site
  on freshly installed (virtual) machines in a fully automated,
  unassited way.

* Tested on Debian, Ubuntu, Scientific Linux, CentOS.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>