Add testing (both frontend and backend) for PostGRES feature post 2.0

[aashish24]

[manthey]

In the database_assetstore plugin, there is a sample dataset of Massachusetts census data. The data was taken from http://www.mass.gov/anf/research-and-tech/it-serv-and-support/application-serv/office-of-geographic-information-massgis/datalayers/census2010.html and converted to a PostGIS sql database. I think I originally followed this guide: http://www.bostongis.com/?content_name=postgis_tut01 . The sample data is located here: https://midas3.kitware.com/midas/item/319584 . This is just the census and boundary data with a few of the columns that were irrelevant for testing removed.

As part of the upgrade of database_assetstore to Girder 2.0, the data will be moved from the midas server to data.kitware.com.