Fix usage for ubuntu 12.04 LTS
ppa: switch to official team-xbmc stable ppa
drop function for applying dirty region rendering as its obsolete
PowerManagment: fixup for ubuntu-13.10,

conesolekit policies aren't installed with policykit-1 anymore. Without
this package we loose reboot and shutodwn options in xbmc
cleanup: don't delete the script after execution (why?)
cleanup: fixup permissions on /home/xbmc/.xbmc folder.

This fixes the issue where if the script was ran by root (which is always is
one way or another) it would mess up the permissions to all the xbmc userdata
files resulting in xbmc not booting
fix reboot command
startup: drop the depreciated init.d script in favor of the upstart script
bump version to v2.7