Merge pull request #27 from wsnipex/master

Prepare for auto upgrade script
Add version checker addon
Bump version and changelog - autoupdate support added
Use tbheadend new stable repo
Revert partial, unfinished Sandy Bridge support, to be added again once fully implementd
Fix missing repos
Use newer live-build
Not needed any more
Switch to raring-based builds
fix ctrl+alt+t shortcut for lxterminal