Basename shell-out needs to be compatible with old coreutils package not supporting "-s"

bin/grid is shelling out to 'basename -s'.   This doesn't work with older versions of coreutils, like what's found on my corp IT workstation image (RHEL 6.1).  I've updated bin/grid to use the older basename syntax for stripping the suffix off a path.  I also confirmed the older basename syntax works with newer versions of basename which do support "-s".