rebase of https://github.com/inugent/cmssw/tree/RelVal_Gen_13TeV/ from 7_0_X to 7_2_X
clean up commented code
Update GGToHtautau_13TeV_pythia8_Tauola_taurhonu_cff.py
Update validation script.
Update validation scripts
switching to genparticles for TauValidation
Merge pull request #4696 from inugent/RelVal_13TeV_7_2_X

Configuration -- Rel val 13 te v 7 2 x
Merge pull request #4953 from inugent/TauValidationToGenParticles_7_2_X

Switching to genparticles for TauValidation
Merge pull request #4952 from ianna/validation-script-update

Validation script update
Merge remote-tracking branch 'origin/CMSSW_7_2_X' into CMSSW_7_0_X