72X - update TopRefSel

Back-port of #6680 for PHYS14:
Update of the configuration example for the Top PAG reference selection https://twiki.cern.ch/twiki/bin/view/CMS/TWikiTopRefEventSel to Run II, running on miniAOD input (superseding #6681 ).
Also update RelVal input to CMSSW_7_2_2_patch1 (superseding #6734 ).