Add GeographicRegion model for TDWG level2

Generated from ogrinspect
Migration for add geographicregion
Simple LayerMapping script to load shapefile
Update load.py for geo regions
Add unicode method to GeographicRegion
Add load geo to load_all_datasets.sh
Unit tests for GeographicRegion
API classes for GeographicRegion

Also simple test.
Need to write a filter
Add geo-capable GeographicRegionFilter

Upgrades drf-gis to 0.2
Live regions in the search

Not hooked up to results though
Use ajax typeahead instead of pre-fetching regions
Merge pull request #87 from NESCent/geographic-regions

Geographic regions