added Pythia8 status code for intermediate resonances
moved b' (pdgId=7) from partons to resonances
added map storing the original ordering of GenParticles in case pointer sorting would change it
Merge pull request #3272 from cms-btv-pog/GenJetsParticleSelectorUpdate_from-CMSSW_7_1_0_pre5

Reco -- Added Pythia8 status code for intermediate resonances to the GenJets particle selector