TST: remove explicit building wheels - wheels are now available on PyPI - use pip cache (#408)
TST: remove explicit building wheels - wheels are now available on PyPI - use pip cache (#408)

* TST: remove building wheels - wheels are now available on PyPI

* add pip cache

* also remove pip wheel for pandas/matplotlib

* don't remove cython for master builds

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