Merge pull request #44 from senkin/master

PU2011 -> PU2012
turn back on met analyser as histos weren't being filled
Merge pull request #45 from phy6phs/master

turn met analyser back on
update to binning analyser to use Event::variables also add different ways to reconstruct gen W and neutrino rether than genMET
Merge pull request #47 from phy6phs/master

Changes to BinningAnalyser
Updated test sample filename.
Updated electron MVA ID requirement to >0.5.
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