First functioning pass at connectivity.

- added unittests (passing)
    - updated run script to take int for number of subds

surf/test/test_polymesh.py

@@ -43,6 +43,14 @@ class TestPM(unittest.TestCase):
         for pi, qi in zip(self.skel.edges_for_vert, self.cube.edges_for_vert):
             self.assertEqual(sorted(pi), sorted(qi))
 
+    def test_edges_for_face(self):
+        for pi, qi in zip(self.skel.edges_for_face, self.cube.edges_for_face):
+            self.assertEqual(sorted(pi), sorted(qi))
+
+    def test_faces_for_edge(self):
+        for pi, qi in zip(self.skel.faces_for_edge, self.cube.faces_for_edge):
+            self.assertEqual(sorted(pi), sorted(qi))
+
 
 if __name__ == '__main__':
     unittest.main(verbosity=3)