Merge pull request #144 from EmyrClement/leptonSF

Work on lepton scale factors
Changes to configs needed for top mass sytematic.
Changes to unfold and measure for mass systematic.
Changes to systematic script for mass sytematic.
Changes to plot and table making script for mass sytematic.
Remove print statement.
Merge pull request #148 from EmyrClement/topMassSystematic

Changes for including top mass systematic
added example for an event loop + histogram
Make plots of pull sigma vs k value.
Fit with exponential plus linear to check if k value choice is different.
updated rootpy
Changes to configs for k Value systematic.
Changes to scripts to include k +/- 1 systematic.
Add wait's at end of scripts.
Changes to config to include kValue systematic.
Changes to scripts to include k Value systematic.  Also fix bug in top mass systematic, where systematic was not being scaled for use in tables.
Remove extra space...
Remove debug printouts.
Add wait statement in x_04
Choose bin that fit reaches flat line rather than rounding to nearest integer.  Also remove alternative fit from being drawn.