Update installer script

With this patch foreman-installer will install and configure DNS, DHCP and TFTP
with correct values. Also it updates README.md and describes the
building process.
Integrate with foreman provisioning setup script

Put more information into README.md
Kickstart file cleanup and default password setup

Root user have password 'root' by default
Fix hardcoded parameters for LiveCD
Change default domain to example.com
Merge pull request #1 from ares/master

Setup foreman provisioning and some other minor improvements