How Gaussian can our Universe be

@article{Cabass2016HowGC,
  title={How Gaussian can our Universe be},
  author={Giovanni Cabass and Enrico Pajer and Fabian Schmidt},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2016},
  volume={2017},
  pages={003-003}
}
26 + 18 pages, 2 figures. References added and minor typos corrected. Matches published version 
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