Automatic updates

As a minimum viable feature I'd propose the following:

• an OPKG repository fed by the buildbot
• a cronjob that updates cjdns and luci-app-cjdns
• option in luci-app-cjdns to disable the cronjob

Further things that should be addressed:

• signing packages
• rolling back an update
• loss of power during update
• updates to the rest of the firmware

Things that could be investigated:

• Freifunk Hamburg allegedly pushes mass auto-updates to hundreds of nodes (@kpcyrd)
• OpenWrt's nbd said fstools snapshots might be worth a look regarding loss of power during updates
• @enigmagroup used to do auto-updates of the cjdns package

https://github.com/freifunk-gluon/packages/tree/master/admin/autoupdater
https://git.metameute.de/lff/pkg_autoupdater/ (old codebase, apparantly)
http://nilsschneider.net/2012/12/24/openwrt-autoupdater.html (de)