added Endicott_2008

Original_study
P. Endicott, S. Y. W. Ho, A Bayesian Evaluation of Human Mitochondrial
Substitution Rates, The American Journal of Human Genetics 82, 895–902
(2008).

Original_dataset
Provided by SYW Ho.

Dataset_license
SYW Ho agreed that dataset could be uploaded to Dryad, so license will
be:
CC0, http://creativecommons.org/publicdomain/zero/1.0/

#Taxa
179

#Sites
13857

#data_blocks
41

Clade
Homo sapiens (humans)

Used for tree inference by original authors?
Yes
edited readme
cleaned up extraneous datasets