libcec: update to libcec-2.1.3.1
CONTRIBUTING.md: ups. remove 'tests'
CONTRIBUTING.md: add link to search issues
CONTRIBUTING.md: add quick git howto
Merge pull request #2284 from klopsknoedel/master

libcec: update to libcec-2.1.3.1
transmission: remove global / per-torrent limits

people should now configure this via transmission web interface
busybox & busybox-initramfs: clean up fastboot
linux: update ngene/octopus patch to latest

now supports more cards including
cine s2 v6.5 & octopus v3. needs testing