CLN: Remove unused internal function
CLN: Remove useless test
TST: Add a test for GeoSeries to/from file
TST: Add tests for 'not in' GeoSeries
TST: Use unittest assertion methods
TST: add missing assertions
TST: Explicit skips of not yet implemented tests
TST: Assertions for expected exceptions
TST: Check that we are prevented from writing mixed types to file
BUG: Fix copy method for GeoSeries and GeoDataFrame
BUG: Use crs of transformed series in transformed frame
TST: Test for transforming GeoDataFrame
BUG: backport _propogate_attributes method from pandas master
BUG: GeoSeries can't use _data attribute with released pandas versions
Merge pull request #33 from kjordahl/test/test-coverage

Improve test coverage and fix copy and to_crs methods.
Initial commit of read_postgis function

Wraps read_sql() and looks for the specified geometry column which gets
converted to shapely geometries. It returns a GeoDataFrame.
Add testing for read_postgis function

It also installs postgis and creates a simple database filled with the borough
data. A new requirements.test.txt file is created so that not everybody
installing geopandas is required to install the packages for testing, psycopg2
in this case.