[Rivet] two ATLAS analyses to be included in Rivet

[Hendrik Hoeth]

Thus spake Frank Siegert (frank.siegert at cern.ch):

> To avoid duplication: I'll deal with the WZ cross section one
> (ATLAS_2011*). The other one seems to be more of an UE analysis, so
> I'll leave that to somebody more familiar with such analyses.

I'll do ATLAS_2012_I1183818 then.

-- 
Journalist: "Can you explain 5 sigma as 99.999something percent?"
Fabiola G.: "Sure, that's 3*10^-7."
(after the CERN Higgs seminar, 4 July 2012)