lib: Give Tags support for the str() function

Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>

lib/tag.py

@@ -26,6 +26,9 @@ class Tag:
         self.widgets = None
         self.lock    = threading.Lock()
 
+    def __str__(self):
+        return self.name
+
     def add_track(self, track):
         with self.lock:
             self.tracks.append(track)

lib/test_tag.py

@@ -11,6 +11,8 @@ class TestTag(unittest.TestCase):
         self.assertIsNone(t.widgets)
         self.assertIsInstance(t.lock, type(threading.Lock()))
 
+        self.assertEqual(str(t), "test")
+
     def test_tag_len(self):
         t = tag.Tag("Test")
         self.assertEqual(len(t), 0)