get njettiness to be consistent with cc implementation

[davidlange6]

More fixes from fastjet-contrib problems. (including a typo fix from the jet/met PR from Sal)

[cmsbuild]

A new Pull Request was created by @davidlange6 (David Lange) for CMSSW_7_3_X.

get njettiness to be consistent with cc implementation

It involves the following packages:

RecoJets/JetProducers

@cmsbuild, @nclopezo, @StoyanStoynev, @slava77 can you please review it and eventually sign? Thanks.
@yslai, @nhanvtran, @mariadalfonso, @TaiSakuma, @schoef this is something you requested to watch as well.
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@nclopezo you are the release manager for this.
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[rappoccio]

Hi, Folks,

It should be as in :
rappoccio@e274f3d

Should I just wait for all of this to settle before fixing it in the next IB?

Cheers,
Sal

[rappoccio]

I have this ready and rebased here :

#6542