adding basic support for plotting shapelylinestrings in GeoSeries objects
add ability to pass axes instance into geodataframe or geoseries plot command
allow bbox filtering in the from_file call that uses fiona
Revert "adding basic support for plotting shapelylinestrings in GeoSeries objects"

This reverts commit 3bdc5c70760db2c8f3ab9a799a38f7d7bbae4134.
merge into upstream master
adding some changes i accidentally blew away, and some axes functionality to plotting.plot_dataframe as well
Merge pull request #9 from acrosby/temp

PR to add specification of axes when plotting and bbox filter when opening vector dataset with the Fiona interface