This test was failing not because the thing it was testing wasn't
working, but because of the way span equality works. Span equality
relies on doc equality, and doc equality is object identity, so spans
from different docs will never be equal.
* initial coref_er pipe
* matcher more flexible
* base coref component without actual model
* initial setup of coref_er.score
* rename to include_label
* preliminary score_clusters method
* apply scoring in coref component
* IO fix
* return None loss for now
* rename to CoreferenceResolver
* some preliminary unit tests
* use registry as callable
