Added stand-alone instructions for older boost versions and added ROOT files to gitignore
Fixes for issue #92:
 - replaced pfRelativeIsolation(0.3) with pfRelativeIsolationRhoCorrected()
 - removed pfRelativeIsolation histograms from ElectronAnalyser
 - removed obsolete comments
TTbar+X analyser:
 - removed obsolete comments
 - uncommented PFRelIso lepton analysers
 - removed non used variables
 - fixed latest problems with Ttbar+X analyser
 - synchronised GJets_HT-200ToInf naming
Merge pull request #94 from kreczko/fixing_non_iso

Fixes for issue #92