Test areas_by_point with the current MAPIT_AREA_SRID

Always testing against SRID=4326 breaks when AREA_SRID or MAPIT_AREA_SRID are set to antything else, like 27700. We can't override_settings either because the settings are used in the migrations that create the database, so when testing they're accessed too early for us to nobble them.
Git-ignore .DS_Store files
Replace print calls with self.stdout.write

This will make testing the command easier and quieter
Add a basic test for importing KML files