Added gamma_* control variables, and redifined MT2 and MHT w/ leptons
Added jet lepton cleaning also for photons
Hemisphere fix
Merging latest changes from Francesco - 10.09.2014

Merge branch 'mergeWithMaria' of https://github.com/pandolf/cmg-cmssw into ControlVariable
Added Zll_* variables
Fixing conflicts from Francesco
added parsing of boris/dominik's samples file
now reading datasets from a file
removing '-' from dataset names, casting args to float in reading from file