Merge pull request #9 from qbuat/master

Postfit Yields Table
Merge pull request #10 from qbuat/master

add stats and norm to the ranking
Merge pull request #11 from qbuat/master

Fix mu impact
update unit test in mva/tests/test_clf_events.py and updates to plot-postfit
minor updates
plot-ranking visual updates and new qcd sample attributes
Merge pull request #12 from ndawe/master

updates: plot-postfit, qcd
add color to np names