BUG: _series_unary_op() should return a Series, not a GeoSeries
TST: Add a type test to test_area to make sure it returns a Series.
Merge pull request #28 from kjordahl/bug/series_unary_op

BUG: _series_unary_op should return a series
adds various transformation functions - shift, rotate, scale, skew, and a few other minor adjustments/fixes
Merge pull request #29 from cfarmer/transform

Adds various transformation functions - shift, rotate, scale, skew
CLN: Clean up imports.  Use absolute imports.
CLN: Lazy imports of matplotlib and descartes
TST: Remove matplotlib and descartes from requirements.txt (at least until there are plotting tests)
TST: Run Travis CI tests on 2.6 as well
Revert "TST: Run Travis CI tests on 2.6 as well"

This reverts commit dbbc9faefca88d739522e298e493d70f3ea5b406.
Merge pull request #31 from kjordahl/cleanup/imports

Clean up imports
TST: Run Travis CI tests on both release and master versions of pandas
TST: Environment variable in .travis.yml needs to be preceeded by dollar sign
TST: Add Cython to requirements (needed to build pandas)
TST: Try direct install of pandas in .travis.yml
BUG: Use generic **kwargs to catch changes in pandas method APIs
Merge pull request #32 from kjordahl/feature/travis-pandas-versions

Run Travis CI tests on multiple pandas versions
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 tests for postgis