Add QG tagger and some extra PU id variables (from Mariarosaria)
Refactor and cleanup code:
- move definition of common modules in a cff
  (cfgs cannot import from cfgs)
- modify the treeProducer so that specific ones can inherit
  from the susyCore one and just add variables
- rename the SUSYGenStatusThree.py so that it follows a more
  consistent naming convention
fix lepton skim
And add module to skim also on jets and met
fix name status3 analyzer
Merge pull request #59 from mariadalfonso/maria_v1

SUSY/TTH python updates