Exotica HLT validation : fixed IB crashes

This pull request follows a previous pull request: https://github.com/cms-sw/cmssw/pull/5105
"Exotica HLT validation : latest developments"

We fixed a problem in the code: the wrong collection of muons was used for the MuonNoBptx path, causing the out-of-range exception.
This is now pushed into the ExoValDev branch.
When testing within the last IB CMSSW_7_2_X_2014-09-15-0200 there is no exception anymore.

The dimuon trigger path list was fixed as well.