Modelling meshblocks

Includes the meshblock model and seed data scripts for census data imported for the Auckland region.

Relies on a bower repo here: https://github.com/tuttinator/simplified_meshblock_geojson

And example of what a meshblock shape is like: https://github.com/tuttinator/simplified_meshblock_geojson/blob/master/geojson/0236103.geojson

This will also be reusable for the census repo, and solved tuttinator/census#6