updated btag SFs to 2012, also made changes to event count analyser so that the btag weights and muon efficiencies are applied for the cutflow
Changes so that EventCount now in synch with historgrams
Latest changes to improve performance
Merge pull request #49 from jjacob/master

Looks ok and does not intervene with Phil's changes.
Merge pull request #48 from phy6phs/master

Added 2012 btag SFs and changed eventcount analyser
First attempt at jet smearing in BAT...doesn't work yet.