Add regression test for #704 and test new model (resolves #704)

(using new English model)

spacy/tests/regression/test_issue704.py

@@ -0,0 +1,14 @@
+# coding: utf8
+from __future__ import unicode_literals
+
+import pytest
+
+
+@pytest.mark.models
+def test_issue704(EN):
+    """Test that sentence boundaries are detected correctly."""
+
+    text = '“Atticus said to Jem one day, “I’d rather you shot at tin cans in the backyard, but I know you’ll go after birds. Shoot all the blue jays you want, if you can hit ‘em, but remember it’s a sin to kill a mockingbird.”'
+    doc = EN(text)
+    sents = [sent for sent in doc.sents]
+    assert len(sents) == 3