TST: add appveyor windows testing
TST: add appveyor windows testing

jdmcbr/geopandas,geopandas/geopandas,jorisvandenbossche/geopandas,jorisvandenbossche/geopandas,micahcochran/geopandas,micahcochran/geopandas,jdmcbr/geopandas,ozak/geopandas,geopandas/geopandas,jorisvandenbossche/geopandas,geopandas/geopandas,ozak/geopandas