Switched geant10 branch to build on slc6.
Merge pull request #500 from degano/geant10_slc6_70X_stable

Switched geant10 branch to build on slc6.
Merge remote branch 'origin/IB/CMSSW_7_0_X/stable' into IB/CMSSW_7_0_X/stable
Merge remote branch 'origin/IB/CMSSW_7_1_X/stable' into IB/CMSSW_7_0_X/stable