Minimal travis yml

Also update apt cache

Add repository for arm embedded stuff

Shut it up.
disable notification and limit git clone depth
Merge pull request #18 from jieter/ci

Minimal travis yml
Delay keypad scanning until capacitor on S-key has charged

(Hopefully) fully solves #19.
Plumbing for configurable min fan speed
Actually commit nvstorage.h

(just wanted to test travis-ci error handling when I had the chance)