Muon fix for Shashlik

[mark-grimes]

Fix for CaloExtractorByAssociator to work with Shashlik suggested by @calabria in his talk https://indico.cern.ch/event/332047/contribution/5/material/slides/0.pdf.

[cmsbuild]

A new Pull Request was created by @mark-grimes (Mark Grimes) for CMSSW_6_2_X_SLHC.

Muon fix for Shashlik

It involves the following packages:

RecoMuon/MuonIsolation

@nclopezo, @cmsbuild, @Degano, @StoyanStoynev, @slava77 can you please review it and eventually sign? Thanks.
@bachtis, @rociovilar this is something you requested to watch as well.
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@fratnikov, @mark-grimes you are the release manager for this.
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[mark-grimes]

merge

Tested with muons and pions.