Merge pull request #4 from sgillies/master

Extra fiona.open features for from_file
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
Merge pull request #5 from sgillies/master

GeoJSON representations of GeoDataFrames
Refactor plotting into a separate module
Implement plotting of points
No need to make a new figure if one already exists
implement LineString plotting
Implement GeoDataFrame plotting in plotting module
Implement coloring polygons by values in column
Support for plotting categorical column data
Add option to draw legend for categorical data
Should plot a colorbar for non-categorical legend, not implemented yet
Merge pull request #7 from kjordahl/feature-plotting

Improvements to plotting
GeoDataFrame test to unittest framework
Actually use unittest assert methods
Add test for values of text columns in GeoDataFrame from file
Add LICENSE.txt file
Merge pull request #8 from kjordahl/enh-testing

A few additions to test