Add geos package
Add the matplotlib-basemap package
Expose the GEOS_DIR variable
Fix basemap's dependencies
Build basemap
Remove unnecessary lines

The GEOS_DIR variable gets created automatically by hashdist, so we don't need
to explicitly create it.
Fix mpl packages installation
Move the mpl specific paths to the mpl package

Now the distutils packge is pristine and has no matplotlib specific hacks.
Merge pull request #21 from certik/basemap

Basemap package