matplotlib Code

moved toolkits to mpl_toolkits

use setup.cfg to set parameters for windows installers

move toolkits to mpl_toolkits, make mpl_toolkits a namespace package.

bumped the svn __version__ number

Fixed possible buffer overrun.

Handle NaNs in the data (on-the-fly as it's drawn).
Add a nan_test.py example to help ensure this stays working.

Streamline quiver by combining X and Y in Nx2 array

added figure.autolayout setting to traited config

Fix legend handles.

Fix shadows of legends.