Code cleaning
Merge branch 'gem-sim-validation' of github.com:geonmo/cmssw into from-CMSSW_6_2_0_SLHC12
Add funtion to calculate effiency.
Add extra options for MuonGEMHits and function which can select roll number.
Change Range of ZR plots.
Fix MuonGEMRecHits plots label.
Merge pull request #3980 from geonmo/gem-sim-validation

Code cleaning and fix label of plots.