Merge pull request #317 from mcepeda/53X_SLC6_Dev

Marged, can we start pattuplizing?
Correct muon dB iso

 - use chargedHadronIso instead of userIso(0)
Update electron PU correction

 - use double_kt6PFJets_rho over kt6PFJets for 2012
Use new rho in electron iso
Keep and separate both dB muon iso versions
Merge pull request #319 from dabelknap/iso_update

Electron/Muon Isolation Update
added ward to give more information on crash
update global tags and force patTuple_cfg.py to pick the GT from the environment
Merge pull request #320 from mverzett/53X_SLC6_Dev

Global Tag stuff