py_package_setup_install function. peyotl in api

The translatingnexson branch of api.opentreeoflife.org
requires peyotl which can be installed by running
git clone (or pull) and then the python setup.py based
installation.
Adding of this step to an earlier branch of
the api repo should not hurt anything.
Merge pull request #215 from OpenTreeOfLife/peyotl-dep

py_package_setup_install function. peyotl in api