Samples, AK8 jets, Status3 for Pythia8

@mariadalfonso and @gpetruc: as discussed now we have three samples.py files, one for CSA14 V1 miniAOD, one for CSA14 V2 miniAOD, and one for PHYS14 V2 miniAOD. Please have a look if this is OK with you. 

This pull request also contains from @gpetruc: reimplementation of the susyGenStatusThree analyzer to adapt it to pythia8 and a new analyzer and type for AK8 jets taken directly from the miniAOD,