EventlistHandler initial draft, WIP
EventlistHandler: fix logic, now working
example showing how to use EventlistHandler within SusyNt

Tested on
mc12_8TeV.179974.Sherpa_CT10_lllnu_WZ_MassiveCB.user.gerbaudo.031979._00007.susyNt.root
gives the correct cutflow, and caches the event list correctly.
bugfix (append fname, not dir)
Merge pull request #5 from gerbaudo/event-list

Event list