Only do an apt-get update if it is over a week ago. It takes a while, so skip it was recently run
Kp setting restore was done twice
Merge pull request #12 from vanosg/develop

Empty cron file doesn't cause abort script
Merge branch 'develop' of github.com:BrewPi/brewpi-script into develop
Split installDependencies in 3 files: dependencies (apt-get), cron and permisisons. runAfterUpdate.sh executes all 3
minor edit to change echo'ed info in fixPermissions
replace /home/brewpi in the cron job with sed, when not installing to the default location
Changed install/ to updates/
Install is a bit of a misnomer, as we're not using this dir to install, just run after updates
Added fixPermissions symlink in root
To not break existing documentation or other dependencies