Merge pull request #17 from phy6phs/test

A few changes see below
change in weighting in EventCountAnalyser
scale factors sans di-electron
Merge pull request #18 from nikberry/backup

Backup
flat SF's for electron
Merge pull request #19 from nikberry/backup

flat SF's for electron
Iso SF's and flat electron SF's
Merge pull request #20 from nikberry/backup

Iso SF's and flat electron SF's
all SF's and top PT reweighting
Merge pull request #21 from nikberry/backup

all SF's and top PT reweighting
changed top pt to just TTJets and TTGamma and wrote Dilepton Trigger functions
Merge pull request #22 from nikberry/backup

changed top pt to just TTJets and TTGamma and wrote Dilepton Trigger fun...
add n-1 for photon analyser and make so that folder is DiLepton so easier to read in plotting tools