update readme: change signning key
upgpkg: linux-linode 3.14.3-4
newpkg: ntp-stable 4.2.6p5-20

Build for the "old" stable NTP release, as the new ntp-dev may be broken.
 - See: https://bbs.archlinux.org/viewtopic.php?id=181288
Merge PKGBUILD from official build of ntp-dev 4.2.7p441
newpkg: ntp 4.2.7p443-1