scripts: addition of kickstart script
- NEW Initial release of kickstart.sh installation helper script. Tested on Ubuntu 14.04 LTS (Trusty Tahr) and on CentOS 7.
- BETTER Completes detailed installation guide for Invenio v3.0. (closes #3555)
Signed-off-by: Tibor Simko <tibor.simko@cern.ch>