implementing new MET corrections
Updating datasets with 2012 samples, x-sections, # of events
Updating histogram input files and plotMttbar script
Adding rho-corrected electron isolation in histograms
Changing to rho-corrected electron isolation in TopPairEPlusJetsReferenceSelection
Bugfix in Electron.h
Adding old QCD samples in DataSetInfo_8TeV to avoid errors
Adding 2012 configuration files
Bugfix: forgot to iterate DY(1,2,3,4) in the filenames
Merge pull request #11 from senkin/MET_corrections

implementing new MET corrections
Merge pull request #17 from senkin/plots_datasets

2012 changes