Merge branch 'python' into erick
added services.geocode

new classes:
* Location
* BaseCoder
* GoogleCoder(BaseCoder)
* YahooCoder(BaseCoder)
deleted nonsensical readers.wos._parse_institutions method
updated networks_test to reflect signature changes
bugfix
bugfix
coauthors now includes geocode option
Merge branch 'erick' into python