Phys14 benchmark lepton selection and JEC, and Heppy updates

 Phys14 benchmark lepton selection: compared to previous criteria now, we have
   * dz 0.2 mm &rarr; 0.1 mm; 
   * relIso cut 0.4 &rarr; 0.5, 
   * EA corrections for 25ns MC
   * Cut-based 2012 electron id using full5x5 cluster shapes

Also, new JEC from the PHYS14_25_V2 global tag are applied, see https://hypernews.cern.ch/HyperNews/CMS/get/jes/499.html