Adds daily cron autoupdater script

Script to do daily automatic updates of the lamp software
installs script as part of install.sh, also copies itself to
/etc/cron.daily at each run.
Reboots the lamp if updates applied successfully.

Note that changes to cronupdate.sh are not executed till the next
days cron update run.
Merge pull request #2 from knupouls/master

Adds daily cron autoupdater script