Merge pull request #35 from jjacob/master

Correcting sample names.
Fix for BristolTopGroup/AnalysisSoftware/#30
Merge pull request #36 from kreczko/master

New definition of HT
Updating measure x-section script with 2012 data/mc
Merge pull request #37 from senkin/updated_xsection_measurement

Updating measure x-section script with 2012 data/mc