Protections for jets and MET for PFEGamma

built ontop of: CMSSW_7_0_X_2013-10-25-0200 + ged_egamma_isolation

Includes protections for jets and MET when using PFEGamma.
PFEGamma is still turned off by default.

@slava77 how do you want me to provide the changes to activate PFEGamma inside of particle flow?

All matrix tests passed.