Add reminder to releases.sh for upgrading kernel image

Signed-off-by: Charles Steinkuehler <charles@steinkuehler.net>
Merge remote-tracking branch 'upstream/master' into config-hooks
Update linuxcnc build to MachineKit-ubc branch
Update to kernel to 'bone26

Signed-off-by: Charles Steinkuehler <charles@steinkuehler.net>
Update dtc generation to auto detect and run any dtc.sh file in the
LinuxCNC configs directory

Signed-off-by: Charles Steinkuehler <charles@steinkuehler.net>
Merge branch 'config-hooks' of https://github.com/cdsteinkuehler/omap-image-builder