fix variable type in Muon and Electron class
first try for photon implementation
add TRootPhoton and PhotonAnalyzer
Merge ssh://github.com/monttj/TopTreeProducer
Merge branch 'dev'
add photon variables following 2012 photon object selection: https://twiki.cern.ch/twiki/bin/view/CMS/CutBasedPhotonID2012