Sc 187/cleanup and docstrings

Created doc strings where missing.

umbra/alignment_strategy.py

@@ -39,6 +39,5 @@ class AlignmentStrategy(ABC):
                 correct += 1
             else:
                 skipped += 1
-        print('Total: {} | Correctly shadowed: {} | Skipped: {}'
-              .format(total_words, correct, skipped))
+
         return total_words, correct, skipped