Added rake task to import a test subset of postcodes so that developers can start working quickly.
Improved verbosity of import scripts a little
Moved the 'get nearest postcode' functionality to the model.
Wrote the get_nearest_postcode_areas method for the postcode model.
Changed postcode#nearest_postcode_areas so that it returns the centroid of the postcode area as the latlng.
Allowed the postcode_controller to return postcode areas instead of postcodes for the nearest method when the distance parameter is more than 5 miles.
Bug fix:undefined method `each' for "...":String when requesting n3 triples.