Nullius in Verba: explanation added.

Added the quote from the Royal Society history web page, explaining the meaning
of the Nullius in Verba motto.
Added references to Rogoff and Reinhart paper.

And how its non-reproducibility became national news.
Fixed title size in Colbert Report clip.
Merge branch 'master' into gh-pages

Sync with master branch. Additional non-reproducibility example.