Error when calling orient on a multipolygon

[rmarianski]

Seeing an error from shapely when calling orient on a multipolygon.

line 334, in orient ring = polygon.exterior | AttributeError: 'MultiPolygon' object has no attribute 'exterior'

We're using Shapely==1.4.3 at the moment.

[rmarianski]

Confirmed the same behavior with Shapely 1.5.12

[nvkelso]

Blocks #210 from going to prod.

[nvkelso]

Opening this back up so it appears in the correct status column.