Added test Observatory Feed
Updated Observatory class to match Observatory feed, ObservatoryTest to use feed
Updated description of Observatory test to be more accurate
Merge pull request #10 from jmfee-usgs/EQH-2173

EQH-2173
Implemented Observatory getDefaultPier, added unit tests
Merge pull request #11 from jmfee-usgs/get_default_pier

Implemented Observatory getDefaultPier, added unit tests