updated hydjet and configs for upcoming 2015 data taking (this is again hydjet-v1.9-implementation branch with clean history)
Merge pull request #5187 from cbaus/hydjet-v1.9-implementation-try2-backport

updated hydjet and configs for upcoming 2015 data taking (this is again ...
Merge remote branch 'origin/CMSSW_7_1_X' into CMSSW_7_0_X