Release for TOP-12-042 version 4

Difference to previous release:
AN-14-071-v5...TOP-12-042_V4

New features:

• tau value unfolding
• ratio plots: automatic limits and horizontal line
• asymmetric bins for plot script
• latex helper module for setting up matplotlib
• added typical systematics tables (median over variable bins)

Bug fixes:

• fix of fit normalisation use in control plots
• fix for control region template in control plots

Setup and dependencies:

• updated RooUnfold
• updated rootpy
• updated matplotlib
• added tabulate python package

Other:

• simplifications in setup
• updated documentation
• removed k-value and light-jet systematics (light jet systematic now included in b-tag systematic)
• updated CMS style
• new control plots: angle_bl & M3
• updated HT & ST bins