Fix script that updates binaries to be python2.6-aware.  Now, the script looks for python2.6, and if that exists, replaces the directories there.  If not, it looks for python2.5, and if that exists, replaces those directories.
Fix script that updates binaries to be python2.6-aware.  Now, the
script looks for python2.6, and if that exists, replaces the
directories there.  If not, it looks for python2.5, and if that
exists, replaces those directories.

scripts/mac_update_bin.sh:
  - be python2.6-aware for new binary versions



VisTrails/VisTrails,celiafish/VisTrails,VisTrails/VisTrails,Nikea/VisTrails,VisTrails/VisTrails,Nikea/VisTrails,celiafish/VisTrails,hjanime/VisTrails,celiafish/VisTrails,minesense/VisTrails,minesense/VisTrails,minesense/VisTrails,Nikea/VisTrails,VisTrails/VisTrails,hjanime/VisTrails,Nikea/VisTrails,minesense/VisTrails,hjanime/VisTrails,VisTrails/VisTrails,hjanime/VisTrails,minesense/VisTrails,celiafish/VisTrails,hjanime/VisTrails