Merge pull request #10 from qbuat/master

CompositeSample
7TeV category and norm tweaks
plot deta_jj in VBF
plot category cuts
Preselection category without MET centrality and VBF category without dEtajj cut
recover old norms
plot_cuts nOS_NONISOL -> nOS
update norms
automatic ratio range
ratio auto range
fold in overflow bins
show pvalue and chi2
update norms
updates
top label
updates
updates
make NON_ISOL the default fakes model
make NON_ISOL the default fakes model
optimize binning