Fixed the Sentence class. It is now a real list. Before, it stored both a list...

Fixed the Sentence class. It is now a real list. Before, it stored both a list class and just a list... It was double at least. Now it is fixed and it still works.

umbra/words.py

@@ -200,14 +200,4 @@ class SourceWord(Word):
 
 class Sentence(list):
     def __init__(self, words):
-        list.__init__(self, words)
-        self.words = words  # I am not sure if this is the 'proper' fix
-
-    def __str__(self):
-        return " ".join([str(w) for w in self.words])
-
-    def __len__(self):
-        return len(self.words)
-
-    def __iter__(self):
-        return iter(self.words)
+        super().__init__(words)