Merge pull request #124 from mjmottram/master

root 53411 for mac OS 10.9
New geant4.9.6.p02 package.

This no longer requires any clhep installation.
This code needs REFACTORING!
Timeout bug fix.
Rat-4.5.0 preliminary package.
Move to geant4.9.6.p02 and remove xerces-c from rat-dev.
Upgrade cmake for mac 10.9 with new 2.8.12.1 version.
Update for release 4.5.0 of rat and rattools.
libexpat fix for grid
First stage installation of xsnoed via snoing.
Update license terms.
Update the root version to 5-34.17 so as to support Mac 10.9.

Also add GDML on to geant4 graphical install.
update to root 5.34.18
Minor xsnoed download fix.