Add data from Tehrani 2013

[joeroe]

Dataset of historic European fairy tales.

• Tehrani JJ (2013) The Phylogeny of Little Red Riding Hood. PLOS ONE 8(11): e78871. https://doi.org/10.1371/journal.pone.0078871

[joeroe]

This, as well as #6, #10, #11, are more historical/ethnographic than archaeological datasets. @benmarwick Are they still within the scope of the package?