Create management command for importing shapefiles

[jeancochrane]

Pull out logic from the soon-to-be deprecated import_data command into its own management command, import_geographies. Specifically, adapt this method, making sure it fits with the new models introduced in #240:

django-councilmatic/councilmatic_core/management/commands/import_data.py

Lines 3196 to 3226 in 5387ae8

	def populate_council_district_shapes(self):
	self.log_message('Populating boundaries ...')
	# grab boundary listing
	for boundary in settings.BOUNDARY_SET:
	bndry_set_url = bndry_base_url + '/boundaries/' + boundary
	r = self._get_response(bndry_set_url + '/?limit=0')
	page_json = json.loads(r.text)
	# loop through boundary listing
	for bndry_json in page_json['objects']:
	# grab boundary shape
	shape_url = bndry_base_url + bndry_json['url'] + 'shape'
	r = self._get_response(shape_url, raise_error=False)
	# update the right post(s) with the shape
	if r:
	if 'ocd-division' in bndry_json['external_id']:
	division_ocd_id = bndry_json['external_id']
	Post.objects.filter(
	division_ocd_id=division_ocd_id).update(shape=r.text)
	else:
	# Represent API doesn't use OCD id as external_id,
	# so we must work around that
	division_ocd_id_fragment = ':' + bndry_json['external_id']
	Post.objects.filter(
	division_ocd_id__endswith=division_ocd_id_fragment).update(shape=r.text)
	print('.', end='')
	sys.stdout.flush()

[fgregg]

I'd like to see if we can lean into the collect static approach. If that's not desirable for some reason, please let me know.

https://docs.djangoproject.com/en/2.2/ref/contrib/staticfiles/

[jeancochrane]

Closed in #249.